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情态动词的基本用法 情态动词本身虽有一定的意义,但它必须和实义动词一起构成谓语动词,表示说话人的语气和情态,情态动词后接动词原形。初中学过的情态动词有can, could, may, must, need, shall, should, will, would, have to等。‎ ‎1. can / could 表示能力(等于be able to)或客观可能性;还可以表示请求或允许;用在否定句、疑问句或感叹句中还可以表示惊异、怀疑、不相信的态度。Can / Could I ...? 表示请求对方许可(用could比用can语气更加委婉和客气,但答语必须用can);Can / Could you ...? 用来表示说话人征求对方意见(用could比用can语气更加委婉和客气)。‎ ‎2. may 表示许可或允许,意为“可以”。May I ...? 表示征求对方许可,否定回答一般用mustn’t或can’t。‎ ‎3. must 意为“必须、应当”,表示义务、命令或必要;在回答must引出的问句时,肯定回答用must,否定回答用needn’t 或don’t have to,表示“没有必要”。‎ ‎4. need 作情态动词时,多用于否定句或疑问句中,表示“需要”或“必要”(need用于肯定句时,常作实义动词,有人称和数的变化)。‎ ‎5. shall 表示说话人征求对方的意见或向对方请示。‎ ‎6. should 意为“应该”,表示义务、责任,可用于各种句式。‎ ‎7. will 用于疑问句中,表示说话人向对方提出请求或建议;还可以用来表示做某事的意志、意愿、决心或打算。‎ ‎8. would 表示过去的习惯性动作,有“总是、常常”的意思;还可表意愿、拒绝、请求等。‎ ‎9. have to 意为“不得不”,强调客观需要,能用于多种时态;而must强调说话者的主观看法,没有时态变化。‎ ‎【专项练习】‎ Ⅰ. 请从各题后所给的A、B、C、D四个选项中选出最佳答案。‎ ‎( )1. —Must we clean the classroom now? ‎ ‎—No, you___________.‎ A. must B. needn’t C. should D. can’t ‎( )2. You____________ be careful with fire when you have a picnic in the forest. ‎ A. will B. must C. can D. may ‎( )3. —May I go surfing alone, Dad? ‎ ‎—No, you____________. It is dangerous.‎ A. may not B. can’t C. needn’t D. don’t ‎( )4. —Should I call Mary here right away? ‎ ‎—No, you____________ . She is on the way here.‎ A. mustn’t B. can’t C. may not D. needn’t ‎( )5. — __________ you mind closing the door?‎ ‎—No, not at all.‎ A. Would B. Can C. May D. Should ‎( )6. I said I _________do anything for him.‎ A. would B. will C. have to D. need ‎( )7. —It’s a secret between us. Don’t tell anybody else. ‎ ‎— ____________.‎ A. I do B. I don’t C. I will D. I won’t ‎( )8. —You must come to the meeting on time. ‎ ‎—OK, I _____________.‎ A. must B. have to C. will D. should ‎( )9. At the age of seven, I ____________speak a little English.‎ A. have to B. could C. can D. should ‎( )10. Many of the stars___________, because they are far away from us.‎ A. may not see B. can’t be seen ‎ C. mustn’t be seen D. needn’t see ‎( )11. —Could I call you by the first name? ‎ ‎—Yes, you _____________.‎ A. will B. could C. might D. can ‎( )12. —Must I return the book tomorrow morning?‎ ‎—No, you____________ . You __________ keep it for three days.‎ A. mustn’t; may B. mustn’t; must C. needn’t; can D. needn’t; must ‎( )13. —May I go out to play basketball, Dad?‎ ‎—No, you __________. You must finish your homework first.‎ A. mustn’t B. may not ‎ C. couldn’t D. needn’t ‎( )14. —Can you go swimming with us this afternoon?‎ ‎—Sorry. I ____________look after my little sister at home.‎ A. can B. may C. would D. have to ‎( )15. —Would you like to go fishing with me this afternoon?‎ ‎—I’d love to, but I’m afraid I__________ . I have too much work to do.‎ A. can’t B. mustn’t C. needn’t D. may not ‎( )16. —What a nice day! __________we go hiking? ‎ ‎—Good idea.‎ A. Shall B. Must C. Need D. Will ‎( )17. We__________ keep the new traffic law and learn how to protect ourselves.‎ A. may B. should C. can D. could ‎( )18. —Must I come at four? ‎ ‎—Oh, no, you ___________.‎ A. don’t B. mustn’t C. don’t have to D. can’t ‎( )19. ___________ you get me some paper, please?‎ A. Shall B. May C. Need D. Will ‎( )20. —May I put my bike here? ‎ ‎—No, you ___________. You __________put it over there.‎ A. may not; may B. needn’t; must ‎ C. mustn’t; should D. won’t; should Ⅱ. 请按要求完成下列各句,每空一词(含缩写)。‎ ‎1. My brother can play chess. (改为一般疑问句)‎ ‎__________ _____________ brother _____________chess?‎ ‎2. You should do the dishes. (改为否定句)‎ You___________ ____________ the dishes.‎ ‎3. Could I open the window? (作肯定回答)‎ ‎______________ , ___________ ____________.‎ ‎4. May I smoke here? (作否定回答)‎ ‎__________, __________ ___________ .‎ ‎5. He must do it himself. (改为同义句)‎ He __________ __________ __________ it himself.‎ ‎6. My sister can ride a bike. ‎ ‎ (用when she was 10 years old改写句子)‎ My sister _________ __________ a bike when she was 10 years old.‎ ‎7. You must sell your car. (改为一般疑问句并作肯定和否定回答)‎ ‎____________ ____________ sell my car?‎ Yes, you _____________. / No, you_____________ .‎ ‎8. The boy is able to write with his left hand.(改为同义句)‎ The boy ___________ ___________ with his left hand.‎ 参考答案 情态动词的基本用法专项练习 Ⅰ. 1-5 BBBDA 6-10 ADCBB 11-15 DCADA 16-20 ABCDC Ⅱ. 1. Can your, play 2. shouldn’t do 3. Yes, you can ‎ 4. No, you can’t / mustn’t 5. has to do ‎ ‎ 6. could ride 7. Must I; must; needn’t 8. can write 情态动词表示推测 ‎【要点提示】‎ 情态动词表示推测是其重要用法之一。可用来表示推测的情态动词主要有must, can / could, may / might等。‎ 肯定推测:‎ must, can / could, may / might都可以表示肯定推测。must 表示把握性极强的推测,意为“肯定、一定”;can / could和 may / might表示把握性不大的推测,意为“也许、可能”。‎ 否定推测:‎ can’t 意为“不可能”,表示很有把握的否定推测,may not意为“可能不”,表示把握性不太大的否定推测。‎ ‎【专项练习】‎ Ⅰ. 请从各题后所给的A、B、C、D四个选项中选出最佳答案。‎ ‎( )1. A teacher __________also make a mistake if he or she is not careful enough.‎ A. must B. may C. should D. has to ‎( )2. —What are you going to eat for supper? ‎ ‎—I__________ have noodles or rice.‎ A. need B. must C. may D. should ‎( )3. —Where’s Lucy? ‎ ‎—I’m not sure. She_________ be in the school library.‎ A. need B. must C. may D. will ‎( )4. —Look! Mr King is on the other side of the street.‎ ‎—It ___________be him. He has gone to Lanzhou.‎ A. mustn’t B. can’t C. shouldn’t D. won’t ‎( )5. Hurry up! Dad __________for us at the train station.‎ A. must wait B. must be waiting C. need wait D. need be waiting ‎( )6. —Tom. Don’t drive too fast. You ___________hit the others’ cars.‎ ‎—OK, I won’t, Mum.‎ A. must B. need C. might D. have to ‎( )7. —Whose book is this? ‎ ‎—It ___________be Peter’s. He entered the classroom just now.‎ A. need B. could C. should D. will ‎( )8. —There _________ many animals in the park. ‎ ‎—You are right.‎ A. has to B. have to C. may have D. may be ‎( )9. —You mean this CD __________ belong to Victor?‎ ‎—Yes, it has his name on it.‎ A. must B. may C. might D. can ‎( )10. —There’s somebody at the door. It __________be Jim.‎ ‎—It ___________be him. It’s just seven o’clock. It’s too early.‎ A. can; can’t B. will; won’t ‎ C. should; mustn’t D. need; may not Ⅱ. 请根据句意,从方框中选择适当的单词填空。‎ must, may, can’t ‎1. Such a businessman __________ be honest. He gets his money in such a dishonest way.‎ ‎2. Mary’s parents have bought a large house with a swimming pool. They ‎__________ be very rich.‎ ‎3. —Excuse me, is this the right way to No. 10 Middle School?‎ ‎—Sorry, I’m not sure. It ___________be.‎ 参考答案 情态动词表示推测专项练习 Ⅰ. 1-5 BCCBB 6-10 CBDAA Ⅱ. 1. can’t 2. must 3. may 查看更多

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