高中英语从句之完全解析

1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，

所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。

2.关系词：引导定语从句的关联词称为关系词，关系词相关系代词和关系副词。关系代词有that, which, who, whom, whose, as等；关系副词有where, when, why等。关系词常有3个作用：1，引导定语从句。2，代替先行词。3，在定语从句中担当一个成分。

注：关系代词有主语.宾语之分。一般whom作为宾语。

4.定语：定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语或句子，汉语中常用‘……的’表示。主要由形容词担任。此外，名词，代词，数词，分词，副词，不定式以及介词短语也能够来担任，也能够由一个句子来担任．单词作定语时通常放在它所修饰的词之前，作前置定语。短语和从句作定语时则放在所修饰的词之后，作后置定语。

（一） 限定性定语从句

一、关系代词（在句中作主语、宾语或定语）

1. that既可代表事物也可代表人，which代表事物；它们在从句中作主语或宾语，that在从句中作宾语时常可省略关系词，

which在从句中作宾语也能够省略。[eg：this is the book （which）you want。]而且，如果which在从句中作“不及物动词＋介词”的介词的宾语，注意介词不要丢掉，而且介词总是放在关系代词which的前边，但有的则放在它原来的位置 2. which作宾语时，根据先行词与定语从句之间的语义关系，先行词与which之间的介词不能丢

3. 代表物时多用which，但在带有下列词的句子中用that而不用which，这些词包括当先行词是anything, everything, nothing , none等不定代词时，或者是由every, any, all, some, no, little, few, much等修饰时等，这时的that常被省略 还有先行词前有序数词或形容词最高级修饰时,或先行词就是序数词或最高级时.以及先行词中既有人又有物时.还有句中前面有which时,都只能用that

4. who和whom引导的从句用来修饰人，分别作从句中的主语和宾语，whom作宾语时，要注意它能够作动词的宾语也能够作介词的宾语

5. whose是关系代词，修饰名词作定语，相当于所修饰成分的前置所有格.它引导的从句能够修饰人和物, 当它引导的从句修饰物体时, 能够与 of which 调换,表达的意思一样。 二、关系副词（在句中作状语） 关系副词=介词+关系代词 why=for which

where=in/ at/ on/ ... which (介词同先行词搭配) when=during/ on/ in/ ... which (介词同先行词搭配) 1. where是关系副词，用来表示地点的定语从句。

2. when引导定语从句表示时间［注］值得一提的是，表示时间“time\"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导。

By the time you arrive in London, we will have stayed there for two weeks. I still remember the first time I met her. Each time he goes to business trip, he brings a lot of living necessities, such as towels, soap, toothbrush etc。

3. 当从句的逻辑主语是some, any, no, somebody, anybody, nobody, something, anything, everything或nothing时，常用there is来引导

There is somebody here who wants to speak to you. 这里有人要和你说话。

（二） 非限定性定语从句

非限定性定语从句的作用是对所修饰的成分作进一步说明，通常是引导词和先行词之间用逗号隔开，将从句拿掉后其他部分仍可成立

1. which引导的非限定性定语从句来说明前面整个句子的情况或主句的某一部分

2.当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非性的，例如：

Charles Smith, who was my former teacher, retired last year. 查理·史密斯去年退休了，他以前是我的老师。 My house, which I bought last year, has got a lovely garden.我去年买的的那幢房子带着个漂亮的花园。 This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。 3.非性定语从句还能将整个主句作为先行词, 对其实行修饰, 这时从句谓语动词要用第三人称单数，例如：

He seems not to have grasped what I meant, which greatly upsets me. 他似乎没抓住我的意思，这使我心烦。 Liquid water changes to vapor, which is called evaporation. 液态水变为蒸汽，这就叫做蒸发。 4. 有时as也可用作关系代词

5. 在非限定性定语从句中，不能用关系副词why和关系代词that，而用who, whom代表人，用which,whose代表事物.；

（三） 关系代词引导的定语从句

1.who指人在从句中做主语

(1) The boys who are playing football are from Class One.

(2) Yesterday I helped an old man who lost his way.

2. whom指人，在定语从句中充当宾语，常可省略。（注：who和whom已无太大区别，能够通用。） (1) Mr. Liu is the person (whom) you talked about on the bus. (2) Mr. Ling is just the boy whom I want to see. (3) The man who/whom you met just now is my friend.

注意：关系代词whom在口语和非正式语体中常用who代替，可省略。

如果在从句中做宾语,就用whom或who.比如： He is the man whom/who I talk to. 如果是在从句中作主语就只能用who.比如： He is the man who has an English book. 3.which指物，在定语从句中做主语或者宾语，做宾语时可省略 (1) Football is a game which is liked by most boys. (2) This is the pen (which) he bought yesterday.

4. that指人时，相当于who或者whom；指物时，相当于which。 在定语从句中做主语或者宾语，做宾语时可省略。

(1) The number of the people that/who come to visit the city each year rises one million. (2) Where is the man that/whom I saw this morning? 5. whose通常指人，也可指物，在定语从句中做定语 (1) He has a friend whose father is a doctor.

(2) I once lived in a house whose roof has fallen in.whose指物时，常用以下结构来代替 (3) The classroom whose door is broken will soon be repaired. (4) The classroom the door of which is broken will soon be repaired. (5) Do you like the book whose color is yellow?

(6) Do you like the book the color of which is yellow?

（四） 注意

介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时 从句常由介词+关系代词引导

(1) The school (that/which) he once studied in is very famous. (2) The school in which he once studied is very famous.

(3) Tomorrow I will bring here a magazine (that/which) you asked for. (4) Tomorrow I will bring here a magazine for which you asked.

(5) We’ll go to hear the famous singer (whom/that/who) we have often talked about. (6) We’ll go to hear the famous singer about whom we have often talked. 注意：1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等 (1) This is the watch which/that I am looking for. (T＝准确) (2) This is the watch for which I am looking. (F＝错误)

2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose

(1) The man with whom you talked is my friend. (T) (2) The man with that you talked is my friend. (F)

(3) The plane in which we flew to Canada is very comfortable. (T) (4) The plane in that we flew in to Canada is very comfortable. (F)

3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词 (1) He loved his parents deeply, both of whom are very kind to him.

(2) In the basket there are quite many apples, some of which have gone bad.

(3) There are forty students in our class in all, most of whom are from big cities

（五） 关系副词引导的定语从句

1. when指时间，在定语从句中做时间状语

(1) I still remember the day when I first came to the school. (2) The time when we got together finally came. 2. where指地点，在定语从句中做地点状语 (1) Shanghai is the city where I was born.

(2) The house where I lived ten years ago has been pulled down. 3. why指原因，在定语从句中做原因状语

(1) Please tell me the reason why you missed the plane. (2) I don’t know the reason why he looks unhappy today. 注意：关系副词引导的从句能够由“介词+关系代词”引导的从句替换 (1) The reason why/ for which he refused the invitation is not clear,

(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.

(3) Great changes have taken place in the city in which./where I was born.

（六） 判断关系代词与关系副词

方法一： 用关系代词，还是关系副词完全取决于从句中的谓语动词。不及物动词后面无宾语，就必须要求用关系副词或者是

介词加关系代词；而及物动词后接宾语，则要求用关系代词。例如： This is the mountain village where I stayed last year. I'll never forget the days when I worked together with you. 判断改错（注：先显示题，再显示答案，横线；用不同的颜色表示出。） （错） This is the mountain village where I visited last year.

（错） I will never forget the days when I spent in the countryside. （对） This is the mountain village (which) I visited last year. （对） I'll never forget the days (which) I spent in the countryside.

习惯上总把表地点或时间的名词与关系副词 where, when联系在一起。此两题错在关系词的误用上。

方法二： 准确判断先行词在定语从句中的成分(主、谓、宾、定、状)，也能正确选择出关系代词/关系副词。 例1. Is this museum ___ you visited a few days ago?

A. where B. that C. on which D. the one

例2. Is this the museum ____ the exhibition was held?

A. where B. that C. on which D. the one

答案：例1 D，例2 A

例1变为肯定句： This museum is ___ you visited a few days ago.例2变为肯定句： This is the museum ___ the exhibition was held.

在句1中，is后应跟表语，只有the one可以，而后面的you visited a few days ago则做one的定语从句。

而句2中, 主、谓、宾俱全，从句部分为句子的状语表地点，既可用副词where，又因 in the museum词组，可用介词in + which 引导地点状语。而此题中，介词on 用的不对，所以选A。

关系词的选择依据在从句中所做的成分，先行词在从句中做主、定、宾语时，选择关系代词 (who, whom, that, which, whose)； 先行词在从句中做状语时，应选择关系副词 ( where 地点状语，when 时间状语，why 原因状语)

（七） 介词+关系词

1）介词后面的关系词不能省略。 2）that前不能有介词。

3） 某些在从句中充当时间，地点或原因状语的\"介词+关系词\"结构可以同关系副词when ,where和why 互换。 This is the house in which I lived two years ago.

This is the house where I lived two years ago.

Do you remember the day on which you joined our club? Do you remember the day when you joined our club?

This is the reason why he came late. This is the reason for which he came late.

（八）先行词和关系词二合一

1)Whoever spits in public will be punished here. (Whoever 可以用 anyone who 代替) 2)The parents will use what they have to send their son to technical school. (what 可以用all that代替)

（九）as,which引导的非限定性定语从句

由as, which 引导的非限定性定语从句，as和which可代整个主句，相当于and this或and that。As一般放在句首，which在句中。 As we know, smoking is harmful to one's health. The sun heats the earth, which is very important to us. 典型例题

1）Alice received an invitation from her boss, ___came as a surprise. A. it B. that C. which D. he

答案C. 此为非限定性从句，不能用 that修饰，而用which.，it 和he 都使后句成为句子，两个的句子不能单以逗号连接。况且选he句意不通。

2）The weather turned out to be very good, ___ was more than we could expect. A. what B. which C. that D. it

答案B。which可代替句子，用于非限定性定语从句，而what不可。That 不能用于非限定性定语从句，it不为连词，使由逗号连接的两个句子并在一起在英语语法上行不通。

3）It rained hard yesterday, ____ prevented me from going to the park.. A. that B. which C. as D. it

答案B. as 和which在引导非性定语从句时，这两个关系代词都指主句所表达的整个意思，且在定语从句中都可以作主语和宾语。但不同之处主要有两点：

(1） as 引导的定语从句可置于句首，而which不可。

(2） as 代表前面的整个主句并在从句中作主语时，从句中的谓语必须是系动词；若为行为动词，则从句中的关系代词只能用which.。 在本题中，prevent由于是行为动词，所以正确选项应为B。 As 的用法例

1. the same… as；such…as 中的as 是一种固定结构, 和……一样……。

I have got into the same trouble as he (has). 例2. as可引导非性从句，常带有'正如'。

As we know, smoking is harmful to one's health. As is known, smoking is harmful to one's health. As是关系代词。例1中的as作know的宾语；

例2中，它充当从句的主语，谓语动词know要用被动式。 一、“as / which” 特殊定语从句的先行成分

1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分，如： My grandmother’s house was always of great importance to me, as my own is.

在一定的语言环境里，有些名词可以具有形容词的性质。这些名词主要是那些表示人的身份、职业、状态的名词。值得一提的是，在这些具有形容词性质的名词之后，引导定语从句的关系代词不能用who / whom. 2. 动词短语先行成分

这种动词短语既可是限定形式也可是非限定形式。如果是动态动词短语，它们在从句中就一般有限定或非限定形式的替代动词do和as / which一起代替。do可以出现，也可以不出现，但不能用其它动词代替。 3. 句子作先行成分

这句子可以是整个主句也可以只是主句中的一个从句。有时是连续几个句子，有时甚至可以是一个完整的故事。 二、“as/which”特殊定语从句在句中的位置

由于先行成分的构成成分不同，“as/which”特殊定语从句在句中的位置有以下几种情况：

1. 形容词做先行成分时：形容词或形容词短语（含具有形容词性质的名词）作先行成分，“as / which”特殊定语从句置于先行成分之后。 2. 动词短语作先行成分时：动词短语作先行成分时，“as / which”特殊定语从句置于先行成分之后。但是，当从句中含有表示主观意志的插入成分时，“as”特殊定语从句可以移至句子之首。

3. 句子作先行成分时：“as”特殊定语从句的位置较灵活，可以置于先行成分之前、之中或之后。但如果先行成分是直接引语，“as”特殊定语从句多在先行成分之前。如果先行成分是否定句，“as”特殊定语从句与否定词的相对位置不同可以使它产生不同的意义。由于“as”特殊定语从句具有这一特点，所以有时它的位置不能随便移动。在非正式的文体里，“which”特殊定语从句可以出现在先行成分之中。 三、“as/which”特殊定语从句的语义功能

一般说来，as与which的语义功能相同，可以相互替换。但先行成分为句子时，它们的语义功能则有差异。 1. 表示结果

表示结果的特殊定语从句与其先行成分之间存在着一定的因果关系，从句中往往使用有结果意义的词，如动词result, make, enable, cause和形容词interesting, surprising, delightful, disgraceful等。 2. 表示评注

表示评注的特殊定语从句对其先行成分所述事实的正确性有肯定的倾向，它通常与那些表示客观事实，普遍真理或某种习性的先行成分连用；从句中则常用一些表示“合乎自然规律”“众所周知”或“经常发生”等意义的词语，如natural, known to all, usual等。 3. 有无状语意义

“as”特殊定语从句具有状语意义（主要是方式状语意义），而“which”特殊定语从句则无状语意义。“as”特殊定语从句的状语意义要求它在语义上与其先行成分的语义保持一致，“which”特殊定语从句则不受这种。 四、关系代词as与which的句法功能 1. as / which 在特殊定语从句中作主语。

as作主语时，谓语动词常为连系动词（主要是be, seem），主语补语为usual、 a rule、 a matter of fact等时，系动词be习惯经常省略。行为动词作“as”特殊定语从句的谓语时一般用于被动语态（其中助动词be常略），不及物的行为动词在“as”特殊定语从句中作谓语的极少，常见的有happen一词。如：

Freddie, as might be expected, was attending the conference.

Which作主语时，谓语动词不限，主语被动皆可，只是谓语动词为被动语态时助动词be省略。 2. as和which都可以在特殊定语从句中宾语。

3. as和 which在特殊定语从句中作补语。如：We thought him a gentleman, as/which he could never be. “as”特殊定语从句中可以主谓倒装，“which”从句中则不能主谓倒装。

如果先行成分不是主语补语或宾语补语，关系代词用which而不用as。如：He talked like a native, which/as he hardly was. 4. which在特殊从定语句中作定语。

which可以在特殊定语从句中作定语，修饰fact, matter, thing 等名词。这些名词代表先行成分表达的意义，有时将其略去句义仍然完整。

as不能作定语。如：I was told to go not by train but bus, which advice I followed.

（十）关系代词that 的用法

(1)不用that的情况

(a) 在引导非限定性定语从句时。 (错)The tree, that is four hundred years old, Is very famous here. (b) 介词后不能用。

We depend on the land from which we get our food. We depend on the land that/which we get our food from. (2) 只能用that作为定语从句的关系代词的情况 (a) 在there be 句型中，只用that，不用which。

(b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。 (c) 先行词有the only, the very,the same,the last,just修饰时，只用that。 (d) 先行词为序数词、数词、形容词最高级时，只用that。. (e) 先行词既有人，又有物时。 (f) 先行词指物，在主句中作表语时． (g) 为了避免重复． (h)先行词是the way时

举例：Is this the book that you borrowed in the library?这是你在图书馆借的那本书吗？ Who that break the window should be punished．谁打碎了窗户都要受到惩罚． All that is needed is a supply of oil. 所需的只是供油问题。

Finally, the their handed everything that he had stolen to the police. 那贼最终把偷的全部东西交给了。

（十一）难点分析

（一）性定语从句只能用that的几种情况

1．当先行词是anything, everything, nothing (something 除外), few, all, none, little, some等代词时，或者是由every, any, all, some, no, little, few, much，each等修饰时

(1) Have you taken down everything that Mr. Li has said? (3) All that can be done has been done (2) There seems to be nothing that seems impossible for him in the world. (4) There is little that I can do for you. 注意1：部分时候that可以省略，如部分例句将that用括号括住。 注意2：当先行词指人时，偶尔也可以用who (4) Any man that/.who has a sense of duty won’t do such a thing.

2. 当先行词被序数词修饰 (1) The first place that they visited in London was the Big Ben. 3. 当先行词被形容词最高级修饰时 (1) This is the best film that I have seen. 4. 当形容词被the very, the only，the same,the last 修饰时

(1) This is the very good dictionary that I want to buy, (2) After the fire in his house, the old car is the only thing that he owned. 当先行词指人时，偶尔也可以用who (3) Wang Hua is the only person in our school who will attend the meeting？ 5. 当先行词前面有who, which等疑问代词时

(1) Who is the man that is standing there? (2) Which is the T-shirt that fits me most?

6. 当先行词既有人，也有动物或者物体时 (1) Can you remember the scientist and his theory that we have learned? （二）关系代词as和which引导的定语从句as和which引导非性定语从句，有相同之处也有不同之处。具体情况是： 1．As和which都可以在定语从句中做主语或者宾语，代表前面整个句子。

(1) He married her, as/which was natural. (2) He was honest, as/which we can see.

2. as 引导非性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思

(1) As is known to all, China is a developing country. (2) He is from the south, as we can see from his accent.

(3) John, as you know, is a famous writer. (4) He has been to Paris more than several times, which I don’t believe. 注意：当主句和从句存在逻辑上的因果关系时，常用which (5) Tom was always late for school, which made his teacher angry. 3. 当先行词受such, the same修饰时，常用as (1) I have never heard such a story as he tells.

(2) He is not such a fool as he looks. (3) This is the same book as I lost last week.

注意：当先行词由the same修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同 (4) She wore the same dress that she wore at Mary’s wedding. 她穿着她在MARY婚礼上穿过的一条裙子。

(5) She wore the same dress as her young sister wore. 她穿着和她妹妹所穿的一样的裙子。 (三)以the way为先行词的定语从句通常由in which, that引导，而且通常可以省略。 (1) The way in which/ that/./ he answered the question was surprising. (四) but有时也可以做关系词引导定语从句 (1) There are very few but understand his idea. ( but= who don’t )

(五) 区分定语从句和同位语从句

1．定语从句修饰先行词，它和先行词是修饰关系； 同位语从句说明先行词的具体内容，是补充说明的关系

(1) The plane that has just taken off is for London. 定语从句 (2) The fact that he has been dead is clear. 同位语从句 2．定语从句由关系代词或者关系副词引导，关系词在句中充当成分，有时可以省略； 同位语从句主要由that引导，在句中一般不做成分；

句子也可以由when, where, how, why, whether, what等词引导，充当成分 (1) The news he told me is true. (2) The news that he has just died is true. (3) The problem that we are facing now is how we can collect so much money. 定语 (4) The problem how we can collect so much money is difficult to solve.

3. 同位语从句和先行词一般可以用be动词发展成一个完整的句子，而定语从句不可以 (1) The idea that we could ask the teacher for advice is wonderful. 同位语 (2) The idea was that we could ask the teacher for advice. (3) The fact that the earth moves around the earth is known to all. (4) The fact is that the earth moves around the earth. 18. 定语从句

定语从句（Attributive Clauses）在句中做定语，修饰一个名词或代词，被修饰的名词,词组或代词即先行词。定语从句通常出现在先行词之后，由关系词（关系代词或关系副词）引出。 关系代词有：who, whom, whose, that, which等。 关系副词有： when, where, why等。 18.1 关系代词引导的定语从句

关系代词所代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。 1)who, whom, that

这些词代替的先行词是人的名词或代词，在从句中所起作用如下： Is he the man who/that wants to see you? 他就是你想见的人吗？（who/that在从句中作主语） He is the man whom/ that I saw yesterday.

他就是我昨天见的那个人。（whom/that在从句中作宾语）

2) Whose 用来指人或物，(只用作定语, 若指物，它还可以同of which互换), 例如：

They rushed over to help the man whose car had broken down. 那人车坏了，大家都跑过去帮忙。 Please pass me the book whose (of which) cover is green. 请递给我那本绿皮的书。 3)which, that

它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，例如：

A prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。（which / that在句中作宾语）

The package (which / that) you are carrying is about to come unwrapped. 你拿的包快散了。(which / that在句中作宾语) ［定语从句］介词+关系词 1)介词后面的关系词不能省略。 2)that前不能有介词。

3)某些在从句中充当时间，地点或原因状语的\"介词+关系词\"结构可以同关系副词when 和where 互换。例如： This is the house in which I lived two years ago. 这是我两年前住过的房子。 This is the house where I lived two years ago.

Do you remember the day on which you joined our club？ 还记得你加入我们俱乐部的那一天吗？ Do you remember the day when you joined our club？

表语从句

一 定义：

A 表语从句就是用一个句子作为表语。说明主语是什么或者怎么[1]样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。

The problem is puzzling. 主语 连系动词 形容词作表语

The problem is when we can get a pay rise. 主语 连系动词 一个句子作表语---表语从句 B 连接表语从句的连接词有：that, what, who, when, where, which, why, whether,how.

He has become a teacher. He has become what he wanted to be ten years ago. She has remained there for an hour. She has remained where I stood yesterday for an hour. His suggestion is good. His suggestion is that we should stay calm. The question is confusing. The question is when he can arrive at the hotel. who will travel with me to Beijing tomorrow. why he cried yesterday.

how I can persuade her to join us in the party. whether the enemy is marching towards us. 二 注意：

A 表语从句一定要用陈述语序。

False: The question is when can he arrive at the hotel. Right: The question is when he can arrive at the hotel. B 不可以用if，而用whether 连接表语从句(as if 例外)。 引导宾语从句时可以互换if/whether 位于介词后要用whether 位于句首时要用whether

引导表语从句，主语从句，同位语从句时要用whether False: The question is if the enemy is marching towards us.

Right: The question is whether the enemy is marching towards us. Right: It looked as if he had understood this question C 不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致。

Right: The question is who will travel with me to Beijing tomorrow. Right: The question is why he cried yesterday. D that在表语从句中不可以省掉。 表语从句的基本用法

表语从句只能置于主句之后，而主句的动词只能是联系动词。

名词性从句在be等系动词后作表语时被称为表语从句， 例如： The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西。(how 在表语从句中充当方式状语)// The scissors are not what I need. 这把剪刀不是我所需要的。(what 在表语从句中充当宾语)// What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。(what在主语从句中作直接宾语， that作为表语从句的引导词在该表语从句中不充当句子成分， 不能省略)// That is what I want to tell you.那就是我想要对你讲的。(what在表语从句中充当直接宾语)// That is why she failed to pass the exam. 那就是她考试不及格的原因。(why 在表语从句中充当原因状语)

注意： “That is why...”是常用句型， 意为“这就是……的原因/因此……”， 其中why引导的名词性从句在句中作表语， 该句型通常用于针对前面已经说明过的原因进行总结， 又如： That is why you see this old woman before you know, Jeanne. 珍妮， 这就是现在这个老太婆出现在你面前的原因。(前文提到Jeanne对老妇人显得苍老憔悴深感诧异， 说话人对她讲述了其中的原因之后，用这一句来进行概括)。// That is why I came. 这就是我来的原因。

下面是两个与“That is why...”形式相似的结构， 它们与“That is why...”结构之间的关系要能够辨析清楚：

(1)“That is why...”与“That is the reason why...”同义， 只不过从语法结构上讲， “That is the reason why...”中why引导的是—个定语从句， 将其中的the reason去掉则与“That is why...”结构一样， 例如： That is (the reason) why I cannot agree. 这就是我不能同意的理由。

(2)“That is because...”句型中从属连词because引导的名词性从句在此作表语， 这也是个常用句型， 意为“这就是为什么……/因为……”。“That is because...”与“That is why...”之间的不同在于“That is because...”指原因或理由， “That is why...”则指由于各种原因所造成的后果， 例如：

He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影， 那是因为他得帮助他的妹妹做作业。(第一句话说明结果， 第二句话说明原因)

He had seen the film before. That is why he did not see it last night.他以前曾看过那部电影， 因此他昨天晚上没有去看。(第一句话说明原因， 第二句话说明结果)

［考题1］ The traditional view is ____ we sleep because our brain is “programmed” to make us do so.

A. when B. why C. whether D. that

［答案］ D

［解析］ 下划线处之后是包含一个原因状语从句的表语从句， 如果看不出它是充当整个句子结构的表语从句将难以把握整个句子的意思。因此， 应选择可引导名词性从句且不充当任何成分的that。

［考题2］ You are saying that everyone should be equal, and this is ____ I disagree. (2004) A. why B. where C. what D. how ［答案］ B

［解析］ 下划线处的引导词引导系动词is后的表语从句并在该表语从句中充当地点状语(“disagree”属于不及物动词， “I disagree”本身是完整的主谓结构)， 下划线应填入引导词where， 表语从句“where I disagree”的意思是“我不同意之处、 我不同意的地方”。 ［考题3］ — I drove to Zhuhai for the air show last week. — Is that ____ you had a few days off? (1999) A. why B. when C. what D. where ［答案］ A

［解析］ 下划线处的引导词引导与系动词is连用的表语从句并在该表语从句中充当原因状语， 下划线应填入表示“因此……”(指因某种原因所造成的结果)的引导词why。

［考题4］ ____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons. A. What; why B. That; what C. What; because D. Why; that ［答案］ A

［解析］ 第一个下划线处的引导词引导主语从句并在该主语从句中充当宾语， 特指她所不理解的事情， 应填入关系代词型的引导词what； 第二个下划线处表示“因此……”(指因某种原因所造成的后果， 由why引导对应的名词性从句)而不是“为什么……”(指原因、 理由， 由because引导对应的名词性从句)， 应填入引导词why。

［考题5］ ____ made the school proud was ____ more than 90% of the students had been admitted to key universities. (2003上海春)

A. What; because B. What; that C. That; what D. That; because ［答案］ B

［解析］ 第一个下划线处的引导词引导主语从句并在该主语从句中充当主语， 特指令校方骄傲的事情， 应选用关系代词型的引导词what； 第二个下划线处引导表语从句表示原因、 理由， 应由that引导对应的名词性从句。 ［考题6］ — Are you still thinking about yesterday’s game? — Oh, that’s ____. (2003北京春)

A. what makes me feel excited B. whatever I feel excited about C. how I feel about it D. when I feel excited ［答案］ A

［解析］ A选项的意思是“令我感觉激动的事物”； B选项的意思是“我觉得激动的任何事物”； C选项的意思是“我对它感觉的方式”； D选项的意思是“令我感觉激动的时间”。四个选项中A最适合跟代表“game”的主语that对应， 充当表语从句。

状语从句 （Adverbial Clause）

状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词(从属连词)引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。

状语从句的种类

用来修饰谓语动词、其它动词、定语、状语或整个句子的从句叫做状语从句。状语从句可分为：

1.时间状语从句； 2.地点状语从句； 3.原因状语从句； 4.条件状语从句； 5.目的状语从句； 6.让步状语从句； 7.比较状语从句； 8.方式状语从句； 9.结果状语从句。

状语从句的时态特点

一般情况下，时间和条件状语从句的谓语动词一般用“一般现在时”表示“一般将来时”，用“现在完成时”表示“将来完成时”。例如： I will call you as soon as I arrive in Beijing. 我一到北京就给你打电话。（这是由as soon as引导的时间状语从句，从句中的谓语动词arrive是一般现在时，表示一般将来时，决不可用will arrive）

As soon as I have finished this work, I will go home. 我一完成此工作，就回家。（从句中的谓语动词用现在完成时have finished，表示将来完成时,决不可用will have finished）

If he comes back, please let me know.如果他回来了，请通知我。（从句中的谓语动词用comes back,表示一般将来时，决不可用will come back）

状语从句讲解和练习

状语修饰动词、形容词、副词或整个句子。通常由副词、介词短语、动词不定式、分词和从句等担当。例如： 1. Naturally , our grandparents were pleased to get our phone call . (副词) 2. We worked hard , from sunrise to sunset . (介词状短语)

3. To help my disabled aunt , I spend an hour working in her house every day . (不定式) 4. Seen from a distance , the farmhouse looked deserted . (过去分词)

5. I know how to light a camp fire because I had done it before .（原因状语从句）

状语的位置比较灵活，可以位于句首、句末或句中。enough用作状语修饰形容词和副词时必须后置。

状语从句主要用来修饰主句或主句的谓语。一般可分为九大类，分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式。尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词

和特殊的连接词即考点。现分别列举如下: 1． 时间状语从句

常用引导词：when, as, while, as soon as, before, after, since , till, until

特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when

I didn’t realize how special my mother was until I became an adult. While John was watching TV, his wife was cooking.

The children ran away from the orchard(果园) the moment they saw the guard. No sooner had I arrived home than it began to rain. Every time I listen to your advice, I get into trouble. 2． 地点状语从句

常用引导词：where 特殊引导词：wherever, anywhere, everywhere Generally, air will be heavily polluted where there are factories. Wherever you go, you should work hard. 3． 原因状语从句

常用引导词：because, since, as, for 特殊引导词：seeing that, now that, in that, considering that, given that. My friends dislike me because I’m handsome and successful. Now that everybody has come, let’s begin our conference.

The higher income tax is harmful in that it may discourage people from trying to earn more. Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable. 4． 目的状语从句

常用引导词：so that, in order that 特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end that The boss asked the secretary to hurry up with the letters so that he could sign them.

The teacher raised his voice on purpose that the students in the back could hear more clearly.

5． 结果状语从句

常用引导词：so … that, so… that, such … that, 特殊引导词：such that, to the degree that, to the extent that, to such a degree that, He got up so early that he caught the first bus. It’s such a good chance that we must not miss it.

To such an degree was he excited that he couldn’t sleep last night. 6． 条件状语从句

常用引导词：if, unless, 特殊引导词：as/so long as, only if, providing/provided that, supposing that, in case that, on condition that We’ll start our project if the president agrees.

You will certainly succeed so long as you keep on trying.

Provided that there is no opposition, we shall hold the meeting here. 7． 让步状语从句

常用引导词：though, although, even if, even though

特殊引导词： as(用在让步状语从句中必须要倒装)，while ( 一般用在句首 )，no matter …， in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whichever Much as I respect him, I can’t agree to his proposal. 尽管我很尊敬他， 我却不同意他的建议。

The old man always enjoys swimming even though the weather is rough. No matter how hard he tried, she could not change her mind. He won’t listen whatever you may say. 8． 比较状语从句

常用引导词：as(同级比较), than(不同程度的比较)

特殊引导词：the more … the more … ; just as …， so…; A is to B what /as X is to Y; no … more than; not A so much as B She is as bad-tempered as her mother. The house is three times as big as ours. The more you exercise, the healthier you will be.

Food is to men what oil is to machine. 食物之于人，犹如油之于机器。 9． 方式状语从句

常用引导词：as, as if, how 特殊引导词：the way When in Rome, do as the Roman do. She behaved as if she were the boss.

Sometimes we teach our children the way our parents have taught us.

10. 状语从句的简化 ♠状语从句的省略

状语从句同时具备下列两个条件:①主句和从句的主语一致，或从句主语为it；②从句主要动词是be的某种形式。从句中的主语和be动词常可省略。例如：

When ( the museum is ) completed , the museum will be open to the public next year . He’ll go to the seaside for his holiday if (it is ) possible. 另外，比较状语从句经常省略。例如： I’m taller than he (is tall ).

The higher the temperature (is), the greater the pressure (is ).

就状语从句而言,有时为了使语言言简意赅,常常将状语从句进行\"简化\"。状语从句的\"简化\"现象在口语中较为普遍,而且在高考中的复现率也较高。因此,有必要对其进行全面、透彻的了解。

状语从句的\"简化\"现象常存在于以下五种状语从句中:①由if, unless等引导的条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的时间状语从句;④由as, as if等引导的方式状语从句;⑤由as, than等引导的比较状语从句。下面针对这五种情形作一归纳。

(1)当状语从句的主语是it,且谓语动词是be时,it和be要完全简化掉。例如:

If (it is) possible, he will help you out of the difficulty.如果可能的话,他会帮你摆脱困境。

You must attend the meeting unless (it is) inconvenient to you.除非情况对你来说不方便,否则你必须出席这次会议。 (2)当状语从句的主语和主句的主语一致时,从句可以将主语和be动词简化掉。常用于以下几种情形: a.连词+形容词

As (he was) young, he learned how to ride a bike.他小时候就学会了骑自行车。 Whenever (she is) free, she often goes shopping.她有空就去逛商店。 Work hard when (you are) young, or you'll regret.少壮不努力,老大徒伤悲。 b.连词+名词

While (he was) a young boy, he was always ready to help others.他在孩提时代就乐于助人。

Although (he was) a farmer, now he is a famous director.尽管他曾是个农民,而现在是位著名的导演了。 c.连词+现在分词

As (she was) walking along the river bank, she was singing a pop song.她沿着河堤边走边唱着流行歌曲。

Although (he is) doing his best in maths these days, he has still got no good marks.尽管近来他一直在学数学,但他仍然没有取得好成绩。 d.连词+过去分词

He won't go there with us unless (he is) invited.除非受到邀请,否则他不会和我们一道去那里。 The concert was a great success than (it was) expected.这场音乐会出乎意料地取得了巨大成功。 e.连词+不定式

He stood up as if (he were) to say something.当时他站起来好像要说什么。He wouldn't solve the problem even if (he were) to take charge.即使他来负责,他也解决不了这个问题。 f. 连词+介词短语

She looked anxious as though (she was) in trouble.她看上去很焦急,好像遇到了麻烦。 He had mastered the English language before (he was) in the USA.他到美国之前就懂英语了。 注意:当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用主格结构来表达。例如:

When the meeting was over, all the people went out of the meeting-room.当会议结束时,人们都走出了会议室。(=The meeting over,

一、时间状语从句

要点: 时间状语从句，由以下连词引导：

when while as after before as soon as since till /until by the time 在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句要用一般现在时。 1.when当...的时候

Mozart started writing music when he was four years old. (当)莫扎特4岁的时候，开始写音乐作品。 2.while当...时

He visited a lot of places while he was traveling. 他在旅途中参观了许多地方。 3.as在...的同时；一边...一边... He smiled as he stood up. 他一边站起来一边笑着。 4.after在...之后

He left the classroom after he had finished his homework the other day. 前几天做完作业之后回的家。 5.before 在...之前

Mr. Brown had worked in a bank for a year before he came here. 布朗先生来这之前已经在一家银行里工作一年了。 6.as soon as 一...就...

We began to work as soon as we got there.

我们一到那就开始工作。

I will write to you as soon as I get home. 我一到家就给你写信。 7.since 自。。。以来 到现在

表示自过去的一个起点时间到目前(说话时间)为止的一段持续时间。主句一般用现在完成时，从句用一般过去时。 Mr Green has taught in that school since he came to China three years ago. 自格林先生来中国以来，他就在这所学校教书。

(还可以用作介词，本句从句还可以用短语：since three years ago(自三年前以来)表示。) 8 till /until

都可以作连词，连接时间状语，也可以作介词，与其它词构成介词短语，在句中作状语。 They walked till /until it was dark. 他们一直走到天黑。

Xiao Ming didn’t leave home till / until his father came back. 小明直到他爸爸回来才离开家。

9. by the time 到。。。为止 (所在句子的主句应用完成时) By the time he gets there , his father has already gone. 他到家的时候，他爸爸已经走了。

By the time I got to school, the class had already began. 我到校时，已经开始上课了。

时间状语从句（adverbial clause of time）

1.由when, while, as引导的时间状语从句。例如：

When you think you know nothing, then you begin to know something.当你以为自己一无所知的时候，你就是在开始知道一些事物了。 When truth is buried under the ground it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着这么一种爆炸性力量，一旦冒出，它就会炸破一切！ Strike while the iron is hot. 趁热打铁。

Will you watch my clothes while I have a swim. 我游泳的时候，请你照看一下我的衣服。

You can feel the air moving as your hand pushes through it. 当你的手在空气中挥动的时候，你就能感觉到空气在流动。 Our headmaster laughed as she spoke.我们的校长边谈边笑。

when, while和as的区别

when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。并且when有时表示“就在那时”。 例如：

When she came in, I stopped eating.她进来时，我在吃饭。(瞬时动词)

When I lived in the countryside, I used to carry some water for him.当我住在农村时，我常常为他担水。（延续性的动词） We were about to leave when he came in.我们就要离开，就在那时他进来了。

While引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如： While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生) I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比）

As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。例如： We always sing as we walk.我们总是边走边唱。（as表示“一边……一边”）

As we was going out, it began to snow.当我们出门时，开始下雪了。（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）

as when while的辨析

as when while都表示主、从句动作同时发生，三者差异如下： 表示“一边。。。一边＂的意思

as 强调两个动作同时进行，并表示对比时 用于发生时间较短时 when

1、还可以表示从句动词的动作在主几句动词的动作＂之前 ＂或＂之后＂发生。 2、when＝and then; at that moment (正在那个时候) while 1、用于时间较长时

2、 强调两个动作同时进行，并表示对比时 有时这三个连词可以互换，有时不可以。 lIt was raining hard when (as) I got there.

我到那里时，正在下大雨。 ( 动作同时发生，when可换为as, 但不能换为while，因为get是点动词.) lWhen I had read the article, he called me.

我看完这篇文章之后，她给我打了电话。( 从句动作发生在主句之前，注意时态表达，只能用when ) lWhen I got to the cinema, the film had begun.

(当)我到了电影院时，电影已经开演了。(从句的动作发生在主句之后，只能用when,并要注意时态) lHe was about to leave, when the telephone rang.

他正要离开，忽然电话响了。( 此时不能放在句首。主句动词一般表达 “正在” “即将”.

while, as不能代替

lShe thought I was talking about her daughter, while, in fact, I was talking about my daughter. 他以为我在谈她女儿，然而，实际上在谈论我女儿。(表转折，对比，when, as都不能代替它) lWhile the alien was buying a souvenir, the girl called the police.

外星人买纪念品时，那女孩给打了电话。(表示主句，从句的动作同时发生，while后引导的状语从句的动词必须是延续动词不能是点动词，因为它表示较长时间)

lMother was worried because little Alice was ill, especially as (when/ while) father was away. 妈妈担心，因为小爱丽丝病了，特别是他父亲不在家的时候。(此时as ,when, while可通用)

2.由before和after引导的时间状语从句。

注意before引导的从句不再用否定式的谓语，并且当before引导的从句位于主句之后，有时译成“就，才”。还要注意主句和从句之间的时间关系。当主句用将来时，从句总是用现在时；如果before引导的从句谓语用的是过去时，则主句动词多用过去完成时，这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。例如： It will be four days before they come back. 他们要过四天才能回来。

Einstein almost knocked me down before he saw me.爱因斯坦几乎把我撞倒才看到我。 My father had left for Canada just before the letter arrived.我父亲恰好在信到之前去加拿大了。 They had not been married four months before they were divorced. 他们结婚还不到四个月就离婚了。 After you think it over, please let me know what you decide.你仔细考虑过以后，告诉我你是怎样决定的。

After we had finished the work, we went home.完成工作之后，我们回家了。（从句用过去完成时，主句用一般过去时） 3.由till或until引导的时间状语从句。

till和until一般情况下两者可以互换，但是在强调句型中多用until。并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。例如： I didn't go to bed until（till） my father came back.直到我父亲回来我才上床睡觉。

It was not until the meeting was over that he began to teach me English.直到散会之后他才开始教我英语。 I worked until he came back.我工作到他回来为止。 I didn't work until he came back.他回来我这才开始工作。 Please wait until I arrived.在我到达之前请等我。

4.由since引导的时间状语从句。

since引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。但在It is ＋时间＋since从句的句型中，主句多用一般现在时。例如： I have been in Beijing since you left. 自从你离开以来，我一直在北京了。

Where have you been since I last saw you? 自上次我和你见面以后，你到哪里去了？ It is four years since my sister lived in Beijing. 我妹妹不在北京住有四年了。 It is five months since our boss was in Beijing.我们老板离开北京有五个月了。 知识扩展

1. It is since从。。。以来多长时间了(因为since +从句或名词，表示一段时间) It is five years since we met last time.从我们上次见面已经五年了。 2. It is +before…(。。。才)

It was a long time before I went to sleep again. 过了很长时间我才睡着。 It was an hour before(＝until) the police arrived. 过了一个小时，才来。

5.由as soon as, immediately, directly, instantly, the moment, the instant, the minute, 等引导的时间状语从句。这些连词都表示“一……就”。例如：

I will go there directly I have finished my breakfast. 吃完早饭，我立即到那里去。

The moment I heard the news, I hastened to the spot.我一听到消息，马上赶到了出事地点。 As soon as I reach Canada, I will ring you up. 我一到加拿大，就给你来电话。

【注意】hardly(scarcely, rarely)…when / before, no sooner…than相当于as soon as之意。主句用过去完成时，从句用一般过去时。当hardly, scarcely, rarely和no sooner位于句首时，主句应用倒装语序。例如：

He had no sooner arrived home than he was asked to start on another journey. 他刚到家，就被邀请开始另一旅程。

No sooner had the sun shown itself above the horizon than he got out of bed to commence work.太阳刚从地平线上升起，他就起床劳动去了。

Hardly had I sat down when he stepped in.我刚坐下，他就进来了。

He had hardly fallen asleep when he felt a soft touch on his shoulder.这个阿拉伯人刚要入睡就感到肩膀上被轻轻一触。 6.由by the time引导的时间状语从句。

注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果主句的谓语动词用一般现在时，主句的谓语动词用将来完成时。例如：

By the time you came back, I had finished this book.到你回来时，我已经写完这本书了。

By the time you come here tomorrow, I will have finished this work. 你明天来这儿的时候，我将已经完成此工作了。 7.由each time, every time和whenever引导的时间状语从句。例如：

Each time he came to Harbin, he would call on me. 他每次来哈尔滨，总是来看我。

Whenever that man says“To tell the truth”, I suspect that he's about to tell a lie.每当那个人说“说实在话”的时候，我猜想他就要说谎了。 You grow younger every time I see you. 每次遇到你，见你更年轻了。

8.由as long as和so long as引导的时间状语从句。这两个连词表示“有多久……就多久”。例如：

You can go where you like as long as you get back before dark. 你可以随意到哪里去，只要在天黑以前回来就行。 I will fight against these conditions as long as there is a breath in my body! 只要我一息尚存，我就要反对这种境况。

二 地点状语从句

地点状语从句 (adverbial clause of place)

地点状语从句一般由连接副词where, wherever等引导，已经形成了固定的句型， 要点: 由连词where和复合关系词wherever (=no matter where )引导. 例如：

句型1：Where＋地点从句，（there）＋主句。

【注意】此句型通常译成“哪里……哪里就……”；主句在从句后面时，there可用可不用；如果主句在从句的前面时，一般都不用there。例如：

Where there is no rain, farming is difficult or impossible.在没有雨水的地方，耕作是困难的，或根本不可能的。

They were good persons. Where they went, there they were warmly welcomed. 他们都是好人。因此他们走到哪里都受到热烈欢迎。 You should have put the book where you found it. 你本来应该把书放回原来的地方。

Where the Communist Party of China goes, there the people are liberated.哪里有了中国党，哪里人民得。 句型2：Anywhere/ wherever＋地点从句，＋主句。

【注意】anywhere本身是个副词，但是，常可以引导从句，相当于连词，意思相似于wherever, anywhere引导的从句可位于主句之前，也可以位于主句之后。 而wherever本身就是个连词，表示“在何处，无论何处”。例如： Wherever the sea is , you will find seamen.有海就有海员。 知识扩展

1.Where there is a will , there is a way. 有志者事竟成。(谚语)

1.It will be mixed school where not all the children are disabled.

他将是一所混合式学校，那里的儿童并不都是残疾。(在限定性定语从句中对限先行词起限定作用。) 2.Wherever you go , I go too.

无论你到什么地方，我都去。(wherever=no matter where)无论何处，多用于句首。 3.Wherever there is smoke , there is fire. 无风不起浪。(谚语)

4. While she was wondering where to go , she met a policeman. 疑问副词where后跟不定式,构成不定式短语.

三、条件状语从句

要点： 表示状语从句由连词if, unless (=if not) 引导。

1.If it doesn’t rain tomorrow, we will go hiking.如果明天不下雨, 我们就去远足. 2.You will get good grades if you study hard.如果你努力学习,就会取得好成绩.

3.I will go to the party unless he goes there too.我不会去参加聚会的, 除非他也去.(如果他不去,我也不去.) 4.You will be late unless you leave immediately.

如果你不马上走,你将会迟到的.(=If you don’t leave immediately, you will be late.) 难点提示：用条件状语从句时要注意时态的正确使用,当主句是将来时的时候,从句要用一般现在时. He will not leave if it isn’t fine tomorrow.一般将来时， 一般现在时

They are going to have a picnic if it doesn’t rain next week.一般将来时, 一般现在时

四、原因状语从句

要点: 由连词because, since, as引导, 也可由for, now that 等词引导 1.I didn’t go to school yesterday because I was ill. 我昨天没去上学，因为我生病了。

2. Since everybody is here, let’s begin our meeting. 既然大家都来了, 让我们开始开会吧.

3. As you are in poor health, you should not stay up late. 既然你身体不好, 你就不该熬夜.

4.I asked her to stay to tea, for I had something to tell her. 我请她留下来喝茶,因为我有事要告诉她.

.难点——because , since , as , for,辨析

1） because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。 I didn’t go, because I was afraid.

Since /As the weather is so bad, we have to delay our journey.

2） 由because引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。

He is absent today, becaus e / for he is ill. He must be ill, for he is absent today.

五、目的状语从句

要点： 目的状语从句由连词that, so that, so…that , in order that 引导。 1.so that 以至, 以便

I’ll run slowly so that you can catch up with me. (目的) 我将慢慢跑以至你能赶上我。

I opened the window so that fresh air might come in. (目的) 我把窗户打开以使新鲜空气可以进来。 2.in order that=so that:为了

We shall let you know the details soon in order that you can/may make your arrangements. 不久我们将会让你知道详情,以便你们能够做出安排。(目的)

六、结果状语从句

要点：结果状语从句由连词( so )that, so…that, such…that, so much/many…that引导。 1.so…that 如此…以至于

The scientist’s report was so instructive that we were all very excited.科学家的报告很有启发性，我们感到很兴奋。 He always studied so hard that he made great progress.他总是那么努力，结果他取得了很大的进步。 2. such…that 如此。。。以至

It’s such nice weather that all of us want to go to the park.天气是如此的好，我们大家都想去公园玩。 3.比较：so和 such

其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little(这四个形容词表多或表少时)连用，形成固定搭配。

so foolish such a fool so nice a flower such a nice flower so many / few flowers such nice flowers so much / little money. such rapid progress so many people such a lot of people

（ so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。） so…that与such…that之间的转换既为 so与such之间的转换。

The boy is so young that he can’t go to school. He is such a young boy that he can’t go to school 难点

+形容词或副词

+形+a(an)+单数可数名词

so +many 或few+复数可数名词 +that +much或 little+不可数名词

so that ,such…that 都可以in order that两者皆可引导目的地状语从句和结果状语从句， 当他们引导目的状语从句时，从句的谓语里常常有can, could, may, might, will, would等次。

so +adj或adv.+ that， such +n.+ that 以上两种句型都表示结果,其中so为副词,后接形容词，副词原型，当可数名词前有many, few；不可数名词前有much, little修饰时，应采用句型：so many (few, much, little )+n. 。 such为形容词, 后只能接名词。这名词既可以地可数的，也可以是不可数的。如果这名词是可数,单数,则必须在名词前加冠词a(an). 常见的形式是:such a (beautiful)garden, such(nice)people.

1。I’ve had so many falls that I’m black and blue all over.我跌了很多跤，浑身数摔得清一块紫一块.

2。there are so few notebooks that I can’t give you any.笔记本太少了,我一本也给不了你. 3。It is such nice weather that I’d like to take a walk.天气是如此只好,以至于我想去散散步. 4。Mike is so honest a man that we all believe him.麦克是如此诚实的一个人,以至于大家都相信他 (=Mike is such an honest man that we all believe him.)

5。The weather is so nice that I’d like to take a walk. 天气是如此只好,以至于我想去散散步.

七、让步状语从句

要点: 表示让步的状语从句由连词 though, although引导. 难点：

lthough, although当虽然讲, 都不能和but连用. Although,(though)…but的格式是不对的.但是他们都可以同yet (still) 连用. 所以thought (although)…yet(still)的格式是正确的.

Wrong: Although he is rich but he is not happy. Right : Although he is rich, yet he is not happy. 虽然他很富有, 然而他并不快乐.

Right : Although we have grown up, our parents treat us as children.

Right : Although we have grown up, our parents still treat us as children.尽管我们已经长大了,可是我们的父母仍把我们看作小孩. although, though 辨析

although 不能though 那样用作副词, 放在句末表示强调时要用even though. 1。He is looking fit, though.但是,他看上去很健康. 考点

2。Even though I didn’t under a word, I kept smiling.尽管我一个字也不懂，我还是一直微笑着。 3。He is quite experienced, he is young, though.尽管他很年轻，他很有经验。 典型例题

1） ___she is young, she knows quite a lot. A. When B. However C. Although D. Unless 答案：C。意为虽然她很年轻，却知道许多。 2) as, though 引导的倒装句

as / though引导的让步从句必须表语或状语提前（形容词、副词、分词、实义动词提前）。 Child as /though he was, he knew what was the right thing to do. = Though he was a small child, he knew what was the right thing to do. 注意：

a. 句首名词不能带任何冠词。

b. 句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。 Try hard as he will, he never seems able to do the work satisfactorily. = Though he tries hard, he never seems… 虽然他尽了努力，但他的工作总做的不尽人意。

3) ever if, even though. 即使 We’ll make a trip even though the weather is bad. 4) whether…or- 不管……都 Whether you believe it or not, it is true. 5) \"no matter +疑问词\" 或\"疑问词+后缀ever\"

No matter what happened, he would not mind. Whatever happened, he would not mind. 替换：no matter what = whatever no matter who = whoever no matter when = whenever no matter where = wherever no matter which = whichever no matter how = however 注意：no matter 不能引导主语从句和宾语从句。 （错）No matter what you say is of no use now.

（对）Whatever you say is of no use now. 你现在说什么也没用了。(Whatever you say是主语从句) （错）Prisoners have to eat no matter what they’re given,

（对）Prisoners have to eat whatever they’re given. 囚犯们只能给什么吃什么。

八、比较状语从句

要点：比较状语从句主要运用于形容词和副词的原级，比较级及最高级的句子之中。 原级

1. as…as 和。。。一样

Jack is as tall as Bob.捷克和汤姆一样高。 2. not so(as)…as …和不一样

She is not so(as)outgoing as her sister.她不如她姐姐外向。 比较级

more…than (更) This book is more instructive than that one. 这本书比那本书由教育意义。 最高级

1.The most…in/of

This book is the most interesting of the three.这本书是三本中最有趣的。 2. the + 形容词+est…of/in

This road is the busiest street in our city. 这条路是我们城市最繁忙的街道。 知识扩展

no more than只不过(嫌少的意思)

1。I have no more than two pens.我只有两支笔。

2。It’s no more than a mile to the shops.去商店不过一英里。 not more than不如。。。；(前者不如后者)

1。Jack is not more diligent than John.捷克不如约翰勤奋。 2。one of the + 名词(复数)….之一(用于最高级)

Han Mei is one of the best students in our school. 韩梅是我们学校最好的学生之一。

九、方式状语从句

方式状语从句通常由as, (just) as…so…, as if, as though引导。

1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是\"正如…\"，\"就像\"，多用于正式文体，例如：

1。Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。 2。As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。

3。Just as we sweep our rooms, so we should sweep backward ideas from our minds. 正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。 2） as if, as though

两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作\"仿佛……似的\"，\"好像……似的\"，例如：

1。They completely ignore these facts as if (as though) they never existed. 他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。）

2。He looks as if (as though) he had been hit by lighting. 他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。） 3。It looks as if the weather may pick up very soon. 看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。） 说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如：

1。He stared at me as if seeing me for first time. 他目不转睛地看着我，就像第一次看见我似的。 2。He cleared his throat as if to say something. 他清了清嗓子，像要说什么似的。

3。The waves dashed on the rocks as if in anger. 波涛冲击着岩石，好像很愤怒。

十、状语从句在写作中的运用

写作中能合理、正确地使用状语从句，不但能地道的表达英文习惯，而且还能使文体结构更加严谨、美观。例如下文：

My hobby

The hobby I enjoy most is fishing.

I started fishing (1)when I was five years old. I’ll never forget the day (2)when my father first took me fishing with him. On that day, I was holding a fishing rod (3)when a fish suddenly started pulling on the line. (4)I was so shocked that I fell into the water. But experience didn’t put me off and I have been fishing ever since.

Now I still go fishing with my father. And we often go out on Sundays and spend the whole day fishing in the river. (1)是由when引导的时间状语从句，这类从句的使用频率很高。

(2)句是由I’ll never forget the day .及when my father first took me fishing with him.两局组成。When在从句中做时间状语。 (3)句也是由when 引导的时间状语从句。When 常与suddenly 连用，主句常用过去进行是。译为 “正在……, 忽然……”. (4)是以 so…that… (太…..以直于……)引导的结果状语从句.

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