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1、Section Grammar情态动词have done的用法语 境 自 主 领 悟 先观察原句Many people think the monster may be a distant cousin of the Loch Ness monster in Scotland.They also think that there might be similar creatures in other lakes around the world.But in China，the idea of the dragon may have come from the alligator.You mi
2、ght have given your parents more help earlier.It must have rained last night，for the road was quite muddy.He cant have forgotten it，for he talked about it yesterday.You ought to/should have done the job more carefully.You oughtnt to/shouldnt have asked such a foolish question.后自主感悟1.句表示可能性的推测，意为“可能，
3、也许”。2.句表示对过去发生的事情的推测，意为“可能已经”。3.句表示对过去事情的很有把握的肯定推测，意为“肯定做过某事”，而句则表示对过去发生事情的有把握的否定推测，意为“不可能做过某事”。4.句表示“过去本应该做却未做的事”，句则表示“过去本不该发生却发生了的事”。1may/might have done sth.表示对过去行为的推测，意为“也许/或许已经做过某事”，might可能性更小，主要用于肯定句和否定句中。John isnt at home.I think he may/might have gone to school.约翰不在家，我想他可能去上学了吧。You might hav
4、e read about it in the newspapers.你可能已经在报纸上看到这个消息了。名师点津might have done有时表示 “本来可以做的事而实际上没有做”，含有 “劝告，责备”的语气。You might have been more careful.你本来可以多加小心的。2must have done sth.表示对过去发生的事或行为的肯定推测，意为“一定做过某事”，只用于肯定句中。He reasoned that since she had not answered his letter she must have left here.他推断，由于她没有给他回信，
5、她一定是已经离开这里了。名师点津含有must have done结构的反意疑问句中，若有表示过去的时间状语，反意疑问部分用“didnt主语？”；若没有表示过去的时间状语，反意疑问部分则用“havent/hasnt主语？”。They must have gone there last night，didnt they?他们昨晚一定是去那里了，不是吗？They must have been to the Great Wall，havent they？他们一定去过长城，不是吗？3can/could have done sth.是对过去的推测，表示“可能做过某事”，主要用于否定句和疑问句中。could
6、语气较委婉，肯定句中一般用could不用can。Mr.Smith cant have gone to Beijing，for I saw him in the library just now.史密斯先生不可能去北京了，我刚才还在图书馆见过他。 Where can they have gone? They could have gone to the cinema.他们能去哪里呢？他们可能去电影院了。名师点津could have done sth.还可表示过去本可以完成而实际上未完成的动作。You could have done better，but you were too careless
7、.你本来可以做得更好，但你太粗心了。即时训练1用适当的情态动词填空George cant have gone too far.His coffee is still warm.We are very worried about Tom.Why hasnt he come back?Dont worry.He may/might have been caught in a traffic jam.How did you do in the test?Not so well.I could have done much better but I misread the directions.The
8、 streets are wet.It must have rained last night.4ought to/should have done 表示过去本来应该做某事(而实际上并没有做)，意为“理应做，本来应该做”，常表示遗憾；ought not to/shouldnt have done 表示“过去本来不应该做某事(而实际上做了)”，含有指责对方或自责的意味。The flowers have died.I should have watered them often.这些花儿都死了。我本来应该常给它们浇水的。(其实没浇水，表示遗憾)You ought not to have told
9、them the truth.你本不应该告诉他们真相的。(其实你告诉他们了，含有责备的意味)5neednt have done sth.表示“本来不必做某事(实际上已经做了)”； need have done sth.表示“本来需要做某事(实际上未做)”I neednt have bought so much wine only five people came.我本来没有必要买这么多酒只来了五个人。He need have hurried to the station.In that case，he wouldnt have missed the train.他本来需要快点去车站。那样的话，
10、他就不会耽误了火车。6would have done sth.表示“原本想做某事”；也可以用于虚拟语气中，表示与过去事实相反。I would have given you the book yesterday，but I didnt cover it completely.我原本想昨天给你那本书的，可是我没能全部读完。It would never have happened without your help.要不是你的帮助，这绝不会发生。即时训练2用适当的情态动词填空I neednt have worried before I came to the new school，for my cl
11、assmates here are very friendly to me.Sorry，Mum! I failed the job interview again.Oh，its too bad.You should have made full preparations.They were abroad during the months when we were carrying out the investigation，or they would have come to our help.单句语法填空1He could/might have passed the exam，but he
12、 was too careless.2Mary cant have stolen your money.She has gone home.3Mr.White should have arrived at 8：30 am.for the meeting，but he didnt show up.4You neednt have woken me up; I dont have to go to work today.5Nobody answered the doorbell; he must have gone out.6He might have said so at the meeting
13、, but Im not sure.7You shouldnt have blamed the boy just now; after all，he is only a child.8He must have known(know) what she wanted.9I could have arrived here on time，but my car broke down on the way.10He neednt have watered(water) the flowers, but he needed to do something to kill time.单句改错1He was
14、 not in the office.I thought he may gone home.may后加have2 Most students in my class failed in the math test. It mustnt have been easy.mustntcouldnt3I was really anxious about you.You couldnt have left home without a word.couldntshouldnt4The driver must have drunk a lot before the accident，but I am no
15、t quite sure of that.mustmight5You should come to the meeting. What was the reason for your absence? should后加have6I shouldnt have enjoyed myself moreit was a perfect day. shouldntcouldnt7You could done it better, but you didnt try your best. could后加have8Honestly，you would have told me.wouldmight9The cake is very sweet. You must put a lot of sugar in it. must后加have10You ought have done this exercise more carefully. ought后加to