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） You must go to bed now. Must I start at once?2. 否定式mustnt 表示“禁止” You mustnt smoke here. We mustnt 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neednt 或dont have to.- Must I stay at home?- Yes, you must. / No, you neednt4. 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neednt，如果其陈述部分mustnt 表示“禁止”，反问句用must. -You must go there, neednt you?- Yes, I must. / No, I neednt/dont have to. You mustnt 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。 对现在的动作进行推测 You must be hungry now, arent you? You must have the wrong number. There is no such person, havent/ dont you? 对正在进行的动作进行推测He must be doing his homework, isnt he？ 对过去发生的动作进行推测 You must have read this book, havent you?It must have snowed yesterday, didnt 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, Ill try not to.（2005全国卷）John, look at the time, _A_ you play the piano at such a later hour? A. must B. can C. may D. need7. 与说话人的愿望相反，“偏偏，偏巧”。 I dont want to be late, but my car must break down on half way. (2004 天津) -Who is standing over there?-well, if you _C_ know, the girl is Marry.A. may B. can C. must D. shall 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。You mustnt always be talking so much.When you learn a foreign language, you mustnt 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. Need2. He _ have completed his work; otherwise, he wouldnt be enjoying himself by the seaside.A. should B. must C. wouldnt D. cant3.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 doingC. could have done D. would have done4. -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 happened5.This cake is very sweet. You _ a lot of sugar in it.A. should B. could have put C. might put D. must have put6. According to the local regulations, anyone who intends to get a drivers license_ take an eye test.A. can B. must C. would D. may7. - Must he come to sign this paper himself? - Yes, he _.A. need B. must C. may D. will8. - May I smoke here? - If you _, choose a seat in the smoking section.A. should B. could C. may D. must9. In crowded places like airports and railway stations, you _ take care of your luggage.A. can B. may C. must D. will10. -She looks very happy. She _ have passed the exam. - I guess so. Its not difficult after all.A. should B. could C. must D. might11. -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 have12. When I was young, I was told that I _ play with matches.A. wouldnt B. neednt C. mustnt D. darent13. 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; may14. - _ 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; must15. -Its hard to believe that Jack _ have fought with the policeman. -Yes. If one _ ask for trouble, it cant be helped.A. would; will B. must; may C. should; must D. need; dare 16. I dont want to be late, but my car _ break down on half way.A. must B. can C. may D. will17. Jonney, you _play with the knife. It is dangerous.A. wont B. mustnt 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 mustnt be late, _?4. Parents mustnt show too much concern for their c