外研版九年级下册英语精品教学课件 Module 4 Unit 3.pptVIP

(3) mustn’t意为“不要”, 表示禁止或不允许。 You mustn’t sit on the stairs. (4) 以must开头的一般疑问句,肯定回答用must, 否定回答要用needn’t。 —Must I return the book now? —No, you needn’t. / Yes, you must. ( )1. —Must I stay at home and take care of her？ —No, you ______. A. mustn’t B. needn’t C. can’t ( )2. Please don’t throw paper about. We _______ keep our environment clean. A. can B. must C. may B B Practice 3. may和might 表示允许或请求；表示没有把握的推测；may 可放在句首，表示祝愿。 He might be at home. May God bless you! 注意： might 表示推测时，不表示时态。只是可能性比may 小。 Peter ______ come with us tonight, but he isn’t very sure yet. 　 A. must　 　B. may　 C. can　 D. will 4. should 表示“应该”，常用来表示劝告、建议, 认为“某人应该做某事”或“有义务责任做某事”。 We should obey traffic laws. You shouldn’t have made this kind of silly mistakes. 这时它可以和 ought to, be supposed to 互换使用 。 2) should (ought to)表示推测时，是指有一定根据的推测，意为“可能、该”。 —When can I come for the photos? I need them tomorrow. —They should be ready by 12:00. It’s nearly seven o’clock. Jack should be here at any moment. — _______ I borrow your MP3? — Sure. Here you are. A. May B. Should C. Must D. Would — Is John coming by train? — He _______, but he may not. He likes driving his car. 　　A. must??????????????? B. can?????????????? C. need?????????????? D. should ( )1. — May I go out now, Dad? — No. You _____ let your mother know first. A. can B. may  C. need D. must D 【解析】考查情态动词词义。由答句中“不”，表示语气要求很坚决，应该是“必须”。 ( )2. — Who’s singing in the next room? — It _____ be her. She has gone to New York. A. can’t B. must C. shouldn’t D. can 【解析】考查情态动词表推测。表示否定推测时，用can’t，意为“一定不……”。must表示推测时，意为“一定……”，用于肯定句；根据答语“她已经去了纽约”可知是否定推测，故选A。 A ( )3.— _______ we clean the classroom at once? — No, you _______. You _______ clean i