情态动词can may must need及练习

1、考点二：情态动词can 的用法，表示某人能做某事。肯定句：主语+can+动词原形+其他I can play the piano .否定句：主语+can +not(cant)+动词原形+其他I can not (cant) play the piano .一般疑问句：Can +主语+动词原形+其他?Can you play the piano?特殊疑问句：特殊疑问词+ can +主语+动词原形+其他?What can you play ?can play the piano情态动词must, can, could, may, might  表推测

2、的用法：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，意思是“一定、准是”，语气较肯定，较有把握。 He must be American. = It is certain that he is Am

3、erican. 他准是个美国人。 （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,如询问某种可能时，应用can。  He must know my address. 他肯定知道我的地址。（一定） He cant know my address. 他肯定不知道我的地址。（一定不） Can he know my address? 他知道我的地址吗？（询问可能性）

4、 （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。 He must have a car now. （现在）他一定有辆小汽车。 He must be doing his exercises in the classroom.（正在进行）他一定在教室里做练习。 He must have finished the work.（过去发生）他一定已完成

5、了工作。 注：must表示推测时很少用于将来的情况。一般不用He must come tomorrow.可用Its certain / Im sure that he will come tomorrow.  （4）在反意疑问句中，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。 He must be a worker, isnt

6、0;he? （现在）他准时个工人，是吗？ It must have rained last night, didnt it? （过去）昨晚一定下雨了，是不是？ You must have learned English for many years, havent you? （完成时）你一定学了好多年英语，是吗？  2. can / could的用

7、法（1）can表示推测“可能性”时，往往用于否定句或疑问句。Cant“一定不”，语气很肯定。can在疑问句中意思是“会、可能”。  He cant be at home. = It is impossible that he is at home. 他一定不在家。（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发生的动作进行推测。 They cant be reading&

8、#160;in the library. 他们一定不在图书馆读书。 He cant have gone to Shanghai for I saw him a minute ago.  他不可能去了上海，我刚才还看见他。  Its so late. Where can she have gone? 天晚了，她可能去哪儿了呢？ （

9、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. He cant be a teacher, is he? 他不是教师，是吗？ She cant have finished her homework, has she? 她一定没有完成家庭作业，是不是？（4）could可用于表示某事有可能发生或可能是事实。 Dont eat

10、60;it. It could be poisonous. 不要吃它，可能有毒。 The plane could be delayed by fog. 飞机可能会因为雾晚点。（5）could还可以用于表示客气、委婉、礼貌的请求语气。 Excuse me, could you tell me the way to the bus station?&#

11、160;Could you help me?  （6）couldnt表示否定推测，表示某事不可能真实，或由于特定事实或环境某事肯定不会发生。 It couldnt possibly be poison. 这不可能是毒药。  注：有时与形容词的比较级连用强调某人或某物不可能再更多地具有某种属性。 You couldnt be more wrong. 你真是大错特错。 I couldnt be

12、0;happier. 我简直是幸福极了。 3. may和might的用法 （1） may, might表示推测“可能性”时，意思是“可能”、“也许”，语气没有must肯定。  He may / might be American. = It is possible that he is American. 他可能是个美国人。  注：might不表示过去时态，只是语气上比may更

13、委婉，表示的可能性更小。（2）may, might表推测时，可以用于否定句，意思是“可能不、也许不”，但不用于疑问句。  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。 He may / might be sleeping now. 现在）他可能正在睡觉。 The boy

14、60;may / might not be watching TV at home. （现在）这个男孩可能没在家看电视  These students may / might have seen the film before.（过去）这些学生以前可能看过这部电影。 （4）may, might还可以推测将来的情况。  I think we shou

15、ld take raincoat with us, it may rain. 我想我们应该带上雨衣，可能要下雨了。 She might not come this afternoon. 她今天下午可能不来了。 Exercises: Complete the sentences using“must”or“cant”. 1. I have tried 

16、;to call him at the office, but there is no reply. He be at home. 2. They have bought a new car. They have a lot of money. 3. She is carrying

17、0;a Japanese newspaper. She be Chinese. 4. He goes abroad a lot, He have an important job.  5. She is a professor at the university. She be very clever.  6

18、. She is acting in a Shakespeare play tomorrow. She be an actress. 【随堂练习】一. 选择填空 1. I thought you _like something to read. So I have brought you some book.A.

19、60;ought  B. might  C. could  D. must  2. That man must be Sarahs husband. -No, he_ be her husband. She is still single. A. cant  B. mustnt  C. may not

20、60;D. ought to   3. Peter _come with us tonight, but he isnt very sure. A. must  B. may  C. can  D. will 4. What _it be?  -It_ be a mail box,

21、0;for it is moving. It_ be a car. A. can; cant; must  B. can; can; must  C. can; mustnt; must  D. must; mustnt; can 5. Look, someone is coming. Guess 

22、_. -Jack. Hes always on time. A. who can it be  B. who he may C. who he can be  D. who it can be  6. I saw Mary in the library yesterday.

23、60;-You_ her. She is still abroad.  A. mustnt see  B. cant have seen  C. mustnt have seen  D. couldnt see  7. David, you_ play with the valuable bottle, yo

24、u _break it. A. wont; cant B. mustnt; may  C. shouldnt; must D. cant; shouldnt  8. Susan refuses to marry Jack now. She _her mind. A. must change  B. shoul

25、d have changed  C. must have changed  D. would have changed  9. Sue_ come together with us tonight, but she isnt very sure yet. A. must B. may C. need 

26、;D. will  10. Aunt Margaret_ the rain, otherwise she would have arrived here by now. A. must have missed B. should have missed C. had missed D. might miss 

27、 1Who is the man over there? Is it Mr. Wu? It _ him, but I am not quite sure.A. may be B. maybe C. is D. must be2Some people feel sick when they read a book in a car or on a boatAmustBshouldCmayDneed3-Must I go to medical school and be doctor like you，Dad？- No, you _, son. Youre free to make your ow

28、n decision. A. cant   B. mustnt     C. shouldnt     D. dont have to考点：考查情态动词辨析。4You be hungry after the long walk. Help yourself to some cakes.A. should B. must C. need to D. ought to5Could you please_ the piano so loudly? Your brother is having a rest now.A.

29、not to play       B. not play       C. dont play      D. to not play6 That pink T-shirt with Ping Ans picture on it _belong to Miss Ma. She admires him a lot. No, it _ be hers. She hates pink colour.A. must, cant B. may,

30、 cant C. can, mustnt D. must, mustnt7-Must I answer it in English?-No, you _. You can use Chinese.A. shouldnt B. cant C. mustnt D. neednt8- _ we go swimming in Xishuanghu Lake today? - Oh, no. Its _ cold to swim on such days. I will catch a cold. A. Will; very B. Will; too C. Shall; very D. Shall; t

31、oo 9People who drink wine _ to drive after May Day.A.dont allow B.isnt allowed C.mustnt allow D. mustnt be allowed10I was asked to attend the meeting before eight.Oh, you_. I'm sorry for not telling you that we have changed the plan.A. must B. can't C. may D. needn't11You have worked for

32、 a long time. You _ be very tired. A. must B. cant C. could D. mustnt12-Can I ask you a question? - No, you_. You _to ask me questions during exams.A. cant, mustnt B. cant, arent supposed C. can, arent supposed D.can, dont have 13What _you do if you _ in Grade 7 now?A. could, are B. would, are C. co

33、uld, was D. would, were 【答案】D 14This CD _ belong to Bill. It has his name on it.A. mustnt B. might C. cant D. must【答案】D 15You drive your car so fast. Its dangerous.A. wouldnt B. shouldnt C. couldnt D. mightnt【答案】B 16-Shall we meet at the station at 8 a.m? -In fact we_.The train _until 10a.m.A.mustnt

34、 ;doesnt leave B.mustnt ;leaves C.neednt ;wont leave D.neednt;will leave【答案】C 17-Mum,_ I watch TV? -No. Unless your homework _.A. could; finishes B. can; will finish C. may; is finished D. can; will be finished【答案】C【18 Look! A man is cutting a tree on the moon. -It _ be true. The teacher said there

35、is no air on the moon.A. cant B. may not C. shouldnt D. mustnt【答案】A19_ you please play tennis with me? Sorry, I _.A. Could; cantB. Could; couldnt C. Can; dont D. Can; couldnt【答案】A20-I broke the window. -You_ play football near the window.A.should B. shouldnt C. had better【答案】B21_you swim? Yes，but Im

36、 not a good swimmer.A. CanB. MayC. NeedD. Must【答案】A 22Is the woman over there Miss White? It _ be her. Shes gone to Hangzhou.A. must B. cant C. neednt D. may【答案】B23 Can your friend sing?-_.A.Yes,I can B.Yes, he can C.No,she can D.No,I cant 【答案】B。24- Where is Kate ?  -_she is cleaning the classr

37、oom.  A. May        B. May be C. Maybe         D. Can 【答案】C【解析】25She _ come to the party, but I am not quite sure.A. wouldB. shouldC. mightD. must【答案】C【26- Are you coming to Davys party, Kate ?- Im not sure, I _ go to the movies instead.A.

38、would B. should C. might D. must【答案】C27It's the library! So you_ make any noise here.A. mustn't B. won't C. need D. may【答案】A【解析】28Look at the sign! It says “No Smoking!” You _ smoke here. Its dangerous.A. mustntB. ought not toC. needntD. dont have to【答案】A29 -May I watch TV now, Mum? -No,

39、 you_. You_ do your homework first.A. don't; must B. don't; can't C: can't, must D. can't; can【答案】C30 Theres somebody at the door. Who _ it be? Is it the postman ?No, it _ be him. Its just seven oclock. Its too early.A. may, cant        

40、60;    B. will, wont           C. may, mustnt       D. must, may not【答案】A31-_ you sing an English song?- Yes, I can.A. Can B. May C. Must D. Need【答案】A32Is John coming by train?He should, but he not. H

41、e likes driving his car, but Im not quite sure.A. must B. can C. may D. need【答案】C33“Wheres my book? I cant find it”.“It _ on your desk.”A. may be B. maybe C. maybe is D. may is 【答案】A二. 用 must / can / could / may / might 正确形式填空. 1. Could I borrow&