情态动词完成时（学生卷）.docx

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1、情态动词表示说话人的态度和看法L在句中（能/不能）独立充当谓语.不受任何人称、数变化的影响2 .后跟动词（什么形式？）本单元着重讲情态动词表示猜测时的用法表示猜测的情态动词有 can（could）, may（might）, must （一定），may not （might） not 可能 不，can（不可能）注意must（一定）的否定形式是, mustift意为L情态动词一般（式）用法：1 .在表示具体的可能性时，can用于否定句和疑问句，may, might,could用于肯定句Eg:或许哈雷彗星五十年后会撞上地球。1） Halei Comet hit the earth in 50 yea

2、s time.A:it be true?2） -Isn t that Ann s husband over there?No, it be him. I m sure he doesn t wear glasses.can t B.mustn t C.won t D.may not2.Can表示一般性的或理论上的可能性，may是表示具体的可能性。Eg： One can travel to Qingdao by boat,by train or by air.I may fly to Beijing next week.Practise.You might as well tell the fu

3、rniture manufacturer that male customers not like the designof the furniture.A. must B. may C. can D. need. My English-Chinese dictionary has disappeared. Who have taken it?A. can B. must C. need D. mayTourism help a country promote the friendship with other countries, but too much tourism create pr

4、oblems.A. may shouldB. might* mayC. can canD. shall maySummary：1）在表示具体的可能性时，用于否定句和疑问句，用于肯定句.2） 表示一般性的或理论上的可能性，是表示具体的可能性。II.本单元的重点 1.情态动词的完成时；情态动词+have done用法：l.must have done “过去一定发生了/做了某事“，表示对过去事情肯定推测，只用于肯定句中。It last night, for the road is quite muddy.昨晚一定下雨了，因为路很泥泞。2. can/cant have done“过去可能发生了（做了

5、）某事/过去不可能发生了（做了）某事”，表示对过去疑问和否定的 推测，用于疑问句和否定句中。There is nowhere to find Tom. Where can he have gone? He to Beijing ,forI saw him just now.到处都找不到汤姆，他可能去哪里呢？他不可能去北京，我刚刚还见他来。3. couldnt have done“过去不可能做过某事”1）表示对过去事情的否定推测We them because of the noise from the river.由于河水的声音我们当时不可能听到他们的谈话。用于虚拟语气If it hadnt b

6、een for your help,! couldnt have succeeded.Meaning ： 4. could have done“过去本来能做某事而实际上没做”（表虚拟）Tom, but he was too careless,汤姆本来能通过考试，但他太粗心了。5. may/might have done“过去可能/也许做了某事”表示对过去发生过的事情的推测，用might可能性更小。It is too late .1 think Tom（ go） to bed.太晚了，我想汤姆或许已经睡了。6. may not /might not have done“过去可能/也许没做过某事”

7、表示对过去发生过的事情推测，用might可能性更小。Tom may not have finished his homework.汤姆可能完成了他的作业。They（regard） me as their friends.他们可能没把我当朋友看待。7. should/ought to have done ”过去本应该做某事而实际上没做”You are too lazy . You（finish） the work yesterday.你太懒了，你昨天本应该完成那项工作。8. shouldn /oughtn have done”过去本不应该做某事而实际上却做了”You（tell） her the

8、truth.你本不该告诉她真相。9. neediTt have done ”过去本来不必做某事但却做了”You（take） a taxi here。你本来不必打车来这里。总结如下表：must haveMeaning, 只用于（肯定/否定）done句。表示对（过去/现在/将来）所做事情的肯定推测。can/could have done 表示对（过去/现在/将来）情况的推测，常用于_（肯定/否定）和疑问句。也可用于虚拟语气，表示过去本来可 以做某事但没做。should/oughtMeaning , 其否定式 shouldnt/oughto have donetnt have done 意思是。ne

9、ednt have doneMeaningmay/mightMeaning ;“might have done 还可表示本来have done可能但实际上没发生”的意思。Practice单项选择Did they visit the famous university?-No. They it, but they spent too much time shopping.A. must have visited B. could have visited C. cant have visited D. shouldnt have visitedI knew she was in because

10、I heard the radio, but she didnt open the door. She the bell.A. might not hear B. mustnt have heard C. couldnt hear D. may not have heardNow, look at our purchase. We so much food and drinks now that Emily wont bewith us for dinner.A. neednt have boughtB. might have boughtC. could have boughtD. ough

11、t to have bought1. Someone my umbrella. I found it wet.A. should have used B. cant have used C. must have used D. could have used-1 have looked for my keys everywhere, but I cant find them.-Sorry to hear that. You them somewhere.A.must loseB.should loseC.must have lostD.should have lost2. His father

12、 him for his rudeness, for Tom looked happy.A.could have forgivenB.might have forgivenC.must forgiveD.must have forgiven3. T cant find my purse. I it in the supennarket yesterday, but Pm not sure.A.should leaveB.must have leftC.might leaveD.could have left二、根据所给汉语意思完成句子.考试后我说这次考试很容易，还说我准能得高分，我的口气听上去

13、想必很是自得。I（sound） very proud of myself after the quiz, saying how easy it was and how I was sure to get a good grade.1 .Linda可能在哪呢？ Linda可能在公司。2 .她一定把钥匙丢了.3 .A:经理可能正在开会。B:不。不可能。4 .他们一定走了，可是应当给我留一个条子呀！补充1情态动词后加进行式表示猜测的情态动词的不同形式已经发生：can/may/must/might+ have done正在发生:can/may/must/might+ be doing （想必正在， 可

14、能正在）情态动词后加进行式 表示的意义：表示“想必正在”“可能正在”They may be discussing the problem,他们可能正在讨论问题。1） It s 12 o clock. They（一定再吃中饭）.2） He（不可能在说真相） the truth.IL情态动词的特殊手法can9t but do sth表示“不得不/只好做某事”I cant but tell you the truth.我不得不告诉你真相。注意：表示“不得不/只好做某事”的句式：cant help but do cant choose but do can do nothing but docan h

15、elp doing sth情不自禁做某事Hearing the sad story ,he can、help crying.听完那个悲伤的故事，他禁不住哭了起来。1. may as well do sth最好/倒不如做某事You may as well finish your work now.你最好现在就完成你的工作。2. may well do sth 相当于 be likely to do sth “很可能做某事”Tickets are likely to be expensive. 入场券可能很贵。3. can not /can never +be +adj enough,can no

16、t /can never +be +too adj”再.,也不过分或“越,.越好”You can never be too careful while crossing the road.You can never be careful enough while crossing the road.过马路的时候，你越细心越好。4. may用于祈使句，表示祝愿May you succeed!祝你成功!5. must表示“偏要，硬要”Must you make so much noise?你非要这么吵吗？6. should与疑问词连用，表示说话人惊讶、难以相信等。How should I know?我怎么知道呢？Why should he think that ?他怎么那么想呢？