must的用法及练习

情态动词must 的用法 1. must 表示必要性，“必须”（肯定句，疑问句常见）

① You must go to bed now.

② Must I start at once?

2. 否定式mustn’t 表示“禁止”

① You mustn’t smoke here.

② We mustn’t be late again. (不许我们再迟到了)

3. 由must 引导一般疑问句时，肯定回答用must，否定回答用needn’t 或don’t

have to.

---- Must I stay at home?

---- Yes, you must. / No, you needn’t

4. 当出现反问句式时，如果其陈述部分must 表示“必须，有必要”时，反问句用needn’t，如果其陈述部分mustn’t 表示“禁止”，反问句用must.

① ----You must go there, needn’t you?

---- Yes, I must. / No, I needn’t/don’t have to.

② You mustn’t go there, must you?

5. must 表示推测时，有3种形式时， 反问句与must 后的动词保持一致。

⑴ 对现在的动作进行推测

① You must be hungry now, aren’t you?

② You must have the wrong number. There is no such person, haven’t/ don’t you?

⑵ 对正在进行的动作进行推测

He must be doing his homework, isn’t he？

⑶ 对过去发生的动作进行推测

① You must have read this book, haven’t you?

②It must have snowed yesterday, didn’t you?

6. must 用于反语，表示劝诫。

-----Must you make so much noise?(你非得吵这么大声吗？)

-----Sorry, I’ll try not to.

（2005全国Ⅲ卷）John, look at the time, __A__ you play the piano at such a later hour? A. must B. can C. may D. need

7. 与说话人的愿望相反，“偏偏，偏巧”。

① I don’t want to be late, but my car must break down on half way. (2004 天津)

② ----Who is standing over there?

----well, if you __C____ know, the girl is Marry.

A. may B. can C. must D. shall

③ Why must it rain on Sunday?

8. must not (always) be doing. “不应该，一定不要”. always 加重不赞成的语气。

①You mustn’t always be talking so much.

②When you learn a foreign language, you mustn’t always be translating everything into your own.

Must用法专练

一、单选

1.John, look at the time. ______ you play the piano at such a late hour? (2005)

A. Must B. Can C. May D. Need

2. He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.

A. should B. must C. wouldn’t D. can’t

3.I was on the highway when this car went past followed by a police car. They ______ at least 150 kilometers an hour.

A. should have been doing B. must have been doing

C. could have done D. would have done

4. ----Tom is never late for work. Why is he absent today?

----Something _____ to him.

A. must happen B. should have happened

C. could have happened D. must have happened

5.This cake is very sweet. You ______ a lot of sugar in it.

A. should B. could have put C. might put D. must have put

6. According to the local regulations, anyone who intends to get a driver’license______ take an eye test.

A. can B. must C. would D. may

7. ----- Must he come to sign this paper himself?

---- Yes, he ______.

A. need B. must C. may D. will

s

8. ----- May I smoke here?

---- If you _____, choose a seat in the smoking section.

A. should B. could C. may D. must

9. In crowded places like airports and railway stations, you _____ take care of your luggage.

A. can B. may C. must D. will

10. ----She looks very happy. She ______ have passed the exam.

---- I guess so. It’s not difficult after all.

A. should B. could C. must D. might

11. ----Guess what! I have got A for my term paper.

----Great! You _____ read widely and put a lot of work into it.

A. must B. should C. must have D. should have

12. When I was young, I was told that I ______ play with matches.

A. wouldn’t B. needn’t C. mustn’t D. daren’t

13. We ______ keep a cool head on overheating development, for it _____ have negative influence upon national economy.

A. should; must B. must; would C. might; could D. must; may

14. ---- ______ I book a table for dinner a few days ahead of time?

----Yes, you _______. The restaurant is always full, especially during the holidays.

A. Must; will B. Must; can C. Shall; shall D. Shall; must

15. ----It’s hard to believe that Jack _____ have fought with the policeman.

---Yes. If one _____ ask for trouble, it can’t be helped.

A. would; will B. must; may C. should; must D. need; dare

16. I don’t want to be late, but my car _______ break down on half way.

A. must B. can C. may D. will

17. Jonney, you ______play with the knife. It is dangerous.

A. won’t B. mustn’t C. should D. shall

二、用must正确形式填空

1. You must go there right now, _______?

2. You must finish the work on time, ____________?

3. We mustn’t be late, __________?

4. Parents mustn’t show too much concern for their children, __________?

5. He must be a worker, _________?

6. You must have studied English for many years, ____________?

7. She must have arrived there yesterday, _________________?

8. -----Must we go now? -------- __________________.(肯/否定回答)

9. You _______ always be talking so much?