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）
①You must go to bed now.
②Must I start at once?
2.否定式mustn’t 表示“禁止”
①You mustn’t smoke here.
②We 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.
②You 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
①You must be hungry now, aren’t you?
②You 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
①You 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”。

①I 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
③Why 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’s 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
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?。