二年级 情态动词.pptVIP

can 表示能力：能够，会（= be able to) She can swim. =She is able to swim. 表示许可：可以（= may) You can use my dictionary. =You may use my dictionary. can not (can’t) 表示能力：不会 I can’t swim. = I am not able to swim. 表示许可：不可以 A:Can I use your dictionary? B:I’m afraid you can’t. 表示推测：不可能 He can’t be in the classroom now. He is in the teachers’ office. may 表示许可:可以（ 比can更正式、更客气） May I borrow your pen? 表示推测：可能、或许 Tomorrow I may go shopping. Tomorrow I might go shopping. ( might在表示推测时，不表示过去式，只是说明可能性比may还小) may not 表示许可：不可以 A: May I come in? B: No, you may not. must 表示义务：必须、应该 (=have to） We must come to school on time. =We have to come to school on time. 可用祈使句代替 =Come to school on time. 表示推测：一定、肯定 He must be in the teachers’ office now. must not (mustn’t) 表示不允许：不准，不可以 They mustn’t take any books out of the reading room. need not (needn’t) 表示没有义务：不必，没有必要 A：Must I hand in my homework now? B：No, you needn’t. can, may, must, need Must I wait till he comes back? No, you _____ not. You _____ not make so much noise in the hospital. Can you ride a bike? No, I _____ not. ________ I play computer games now? No, you _____ do your homework first. My mother is ill. I _____ stay at home and look after her. ________ I use your car? Yes, you ________. 保持句意不变 1. You must do your homework first. You _____ _____ do your homework first. 2. She can cook well. She _____ _____ _____ cook well. 3. Wash your face at once. You _____ wash your face at once. You _____ return the book now. You can keep it until next week. A) can’t B) mustn’t C) needn’t D) may not 2. Can I leave this door open at night? No, you _____. should better not would better not had better not 3. Hurry up. He _____ for us at the station. must wait must be waiting should wait should be waiting 4. A: The food must be good. B: No, it _____ be good. must not needn’t wouldn’t can’t 5. Your shirt is rather dirty. _____ I wash it for you? Do Will Have Shall 精心整理 . 精品课件 高品质资料 最好 had better had better 敢于 d