高中英语复习北师大版《情态动词 have done》 课件 (共15张PPT).ppt

1、情态动词第二讲情态动词+have done许昌建安区一高孙慧超情态动词have done情态动词have doneReview Must,may和cant+do/be doing 是对什么时候的事情进行推测？1.Tom cant be at home at present.There is nobody to answer the phone.2.My sister went to the cinema an hour ago.Now she must be seeing a film.must+have+done 表示对过去事情的肯定推测，译成一定做过某事，该结构只用于肯定句。1.It mu

2、st have rained last night,for the ground is wet.昨晚一定下雨了，因为地面还是湿的。2.You must have been mad to speak to the criminal.你和罪犯说话，一定是发疯了。may/might+have+done 表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。What has happened to George?I dont know.He may have got lost.乔治发生了什么事？我不知道，他可能迷路了 She might have achieved greater

3、progress,if you had given her more chances.如果你多给她点机会，她可能已经取得更大的成绩。She might have achieved greater progress,if you had given her more chances.如果你多给她点机会，她可能已经取得更大的成绩。She might have achieved greater progress,if you had given her more chances.如果你多给她点机会，她可能已经取得更大的成绩。cant+have+done 表示对过去事情的否定推测，译成“不可能做过某事

4、”1.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。2.Mary cant have stolen your money.She has gone home.玛丽不可能偷你的钱，她回家去了。表示对过去事情的否定推测，译成“不可能做过某事”could+have+done 是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做.He could have passed the exam,but he was too careless.本来他能

5、够通过考试，但是他太粗心。Should/shouldnt+have+done should+have+done意思是“本来应该做某事，而实际没做。”“shouldnt+have+done”表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。The work should have been finished yesterday.这项工作本来应该昨天就做完的。Tom is crying.I shouldnt have been so harsh on him.汤姆哭了，我本来 不应该对他如此严厉。neednt have done 表示“做了本来不必做的事情”，通常不用于肯定句。例如：It

6、s only five minutes walk.We neednt have taken a taxi.只有5分钟的步行路程，我们本不必乘出租车的。It is warm today.You neednt have wornyour coat.今天天气暖和，你本来不必穿大衣的。情态动词have done高频考点深化突破考点诠释对点演练should/wouldcouldneednt 情态动词have done高频考点深化突破mustcouldneedcouldmightmust考点诠释对点演练 1.Do you know where David is?I couldnt find him any

7、where.Well,he _ have gone far,for his coat is still here.A.shouldnt B.mustntC.cantD.wouldnt 2.He _ you more help,even though he was busy.A.might have given B.might not give C.may not have given D.may give 3.There was plenty of time.She _.A.mustnt have hurried B.couldnt have hurried C.mustnt hurry D.

8、neednt have hurried 4.Tom graduated from college at a very young age.Oh,he _ have been a very smart boy then.A.could B.Should C.might D.must 5.My English-Chinese dictionary has disappeared.Who _ have taken it?A.shouldB.mustC.couldD.shall 6.I really worried about you.You _ home without a word.A.mustnt leave B.shouldnt have left C.couldnt have left D.neednt leaveGoodbye!