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1、UNIT8 语法篇_熟练掌握本模块语法知识。 情态动词表推测 用法 情态动词中的must, can, could, may, might都表推测。其中must的可能性最大，can/could次之， may/might最小。具体用法如下： 1. must的用法 (1) 表示推测“可能性”时，意为“一定，准是”，语气较肯定，较有把握。如：He must be an American. 他肯定是美国人。 (2) must表推测只能用于肯定句。如果要表示“一定不，肯定不”的意思时，应用cant，若询问某种可能 时，应用can。如： He must know my address. 他肯定知道我的地址。
2、 He cant know my address. 他不可能知道我的地址。 Can he know my address? 他可能知道我的地址吗？ (3) must表示推测时，可以推测现在/正在发生的动作/过去发生的动作。如： He must have a car now. 他现在肯定有车。 He must have finished the work. 他肯定已经完成工作了。 注：must表示推测时很少用于将来时。(4) 在反义疑问句中，当附属部分含有表示推测意义的must时，疑问部分的助动词应与must后面的动词 在非推测情况下的用法保持一致。如： He must be a worker,
3、 isnt he? 他肯定是工人，是吗？It must have rained last night, didnt it? 昨晚肯定下雨了，是吗？ You must have learned English for many years, havent you? 你肯定已经学英语很多年了，是吗？ 2. can & could (1) can表示推测“可能性”时，往往用于否定句或疑问句中。Cant意为“一定不”，语气很肯定。Can在疑 问句中的意思是“会，可能”。如： He cant be at home. 他不可能在家。 (2) can/cant后可接进行时/完成时，表示对现在发生的动作或过去
4、发生的动作进行推测。如： They cant be reading in the library. 他们不可能在图书馆读书。 He cant have gone to Shanghai for I saw him a minute ago. 他不可能去上海了，因为我一分钟前见他了。 Its so late. Where can she have gone? 太晚了，她能去哪儿了呢？ (3) 在反意疑问句中，当陈述部分含有表示推测意义的cant时，疑问部分的助动词应与cant后面的动词在 非推测情况下的用法 保持一致。如： He cant be a teacher, is he? 他肯定不是教师
5、，是吗？ She cant have finished her homework, has she? 她肯定没有完成作业，是吗？ (4) could可用于表示某事有可能发生可能是事实。如： Dont eat it. It could be poisonous. 别吃，可能有毒。 The plane could be delayed by fog. 飞机可能因为大雾晚点。 3. may & might (1) may, might表示推测“可能性”时，意为“可能；也许”，语气没有must肯定。如： He may/might be American. 他可能是美国人。 注：might不表示过去时态
6、，只是语气上比may更委婉，表示的可能性更小。 (2) may, might表推测时，可以用于否定句，意为“可能不、也许不”，但不用于疑问句。如： He may/might not be at home. 他也许不在家。 (3) may, might可以推测现在正在发生的动作或过去发生的动作。如： He may/might be sleeping now. 他可能正在睡觉。 These students may/might have seen the film before. 这些学生之前可能看过这部电影。(4) may, might还可以推测将来的情况。如： I think we shoul
7、d take raincoat with us, it may rain. 我觉得我们应该带雨衣，可能会下雨。 She might not come this afternoon. 她今天下午可能不来。1.Why did Miss Wang look so worried?Because she wondered .A. where did the other students goB. when would the policeman comeC. what her students have done during the tripD. if her students had surviv
8、ed the earthquake2.Must I finish my homework now？No，you .You may have a rest first.A. mustnt B. cant C. may not D. neednt3.Remember off the light and dont forget the door when you leave the room.A. to turn；to close B. to turn；closingC. turning；to close D. turning；closing4.Is that girl Susan?It be he
9、r. She left for Beijing yesterday.A. neednt B. cant C. mustnt D. may not5. In spring, the park with travellers.A. crowds B. crowded C. is crowded D. crowding解析：1.本题考查宾语从句的时态通常与主句时态保持一致，故可排除C项；宾语从句应用陈述语序，故选D。2. 本题考查以must提问的一般疑问句，肯定回答用must（必须），否定回答用neednt或dont/doesnt have to（不必）。故选D。3. 本题考查remember/fo
10、rget to do sth.“记得/忘记去做某事”，事情未做；remember/forget doing sth.“记得/忘记做了某事”，事情已做。由句意“在你离开房间时，记得关灯，别忘了关门”。“关灯”“关门”都未做，故选A。4. 本题考查neednt “不必”，cant“不可能”，mustnt“禁止”， may not“可能不”。由答语后句句意“昨天她动身去了北京”可知那个女孩不可能是Susan。故选B。5. 根据句意：春天，公园里挤满了游客。be crowded with“被挤满”，是固定短语。故选C。基础演练一用所给词的适当形式填空1. Its difficult for a per
11、son to deal with a group of(wolf). 2. He lost his bag. Luckily there isnt anything(value)in it. 3. The boy often feels(sleep)in class. 4. Look! Theres a monkey(jump)up the tree. 5. All the children are having fun(play)games in the park.6. -Whose bike is this? -It must be _ (John). He has a black bik
12、e.7. The guitar could _ (be) my cousins. She plays it every day.8. We were extremely (极其，非常) _ (worry) by these results.9. The noise-maker is having too much fun _(create) fear in the neighborhood. 10. -Today is Sunday. The students _ (possible) dont go to school. -I agree with you.11. Its time to g
13、o home. Your mother must be _ (wait) for you at home now. 答案:1. wolves2. valuable3. sleepy4. jumping 5. playing 6. Johns 7. be 8. worried 9. creating 10. possibly 11. waiting巩固提高二、用must, could, might, cant, belong to填空。1. Youd better take an umbrella. It _ rain this afternoon.2. Gina _ come to the party tonight, but Im not sure.3. Is this Yang Yangs notebook? It _ be his. His name is on it.4. The telephone is ringing, but nobody answers it. He _ be at home. 5. The hair band _ Alice. She left
