1、情态动词+ have done,1)must have done对过去已经发生的事的肯定推测.(只用于肯定句),He must have gone to bed, for the light was out.,Where is my pen? I must have lost it.,2)can/could have done对过去行为的怀疑和不肯定的推测.(常用于否定句和疑问句) 在否定句意为“不可能, 不会是”,Mick cant/couldnt have found his car, for he came to work by bus this morning.(不可能/不会找到车),
2、Can she have heard from you?她可能收到你的信吗?,注意: could+ have done 具有两层意思 表示对过去发生的事的揣测, 可与can互换. 表示对过去能做的事而没有做, 不可与can替换.意为:“本来可以做/能做”,-I stayed at a hotel while in NewYork. -Oh. Did you? You could havestayed with Barbara.,有时含有责备或遗憾的意思.,You could have done it better.You could have come earlier.,你本可以把这件事做得更
3、好.,你本可以来的更早.,3)may/might have done 表示推测,可能性更小, 主要用于肯定句.译为: “或许”,He may/might have gone to the library.他或许已经去图书馆了.,might +have done 有时含有委婉的 责备或庆幸等感情. 这时不能用may,You might have told me earlier. 你本可以早点把消息告诉我的.,4)should have done 表示本应该做但却未做, 含有“后悔,遗憾,责备,批评”之意.,You should have been more careful.你本应该更细心些.,Y
4、ou shouldnt have told him about it.你本不该告诉他这事.,5)neednt have done 表示“本来用不着, 本不必” 之意.,You neednt have asked him.(But you asked him.),You neednt have come. I havefinished the work.,情态动词巩固练习,1.-I stayed at a hotel whilein New York.-Oh, did you? You_with Barbara.A.could have stayed B.could stayC.would st
5、ay D.must have stayed,A,2.I didnt see her in the meeting room this morning. She_at the meeting A.mustnt have spokenB.shouldnt have spokenC.neednt have spoken D.couldnt have spoken,D,3.He_you more help, eventhough he was busy.A.might have given B.must have givenC.can have given D.may give,A,4.-I saw
6、our teacher in theoffice just now.-You_her, she is still abroad.A.cant have seen B.mustnt have seenC.neednt have seen D.shouldnt have seen,A,5.Kate is already two hours late. What_to her?A.can have happened B.may have happenedC.should have happenedD.must have happened,A,6.We_last night, but we went
7、to the concert instead. A.must have studied B.might study C.should have studied D.would study,C,7.There was plenty of time. She_.A.mustnt have hurried B.couldnt have hurriedC.mustnt hurry D.neednt have hurried,D,8.Sorry, Im late. I_have turned off the alarm clock and gone back to sleep again.A.might
8、 B.should C.can D.will,A,9.Yesterday, Jan walked away from the discussion.Otherwise, she_something she would regret late.A.has said B.saidC.might say D.might have said,D,10.-Did you scold him for his mistake?-Yes, but _it.A.Id rather not do B.Id better not doC.Id better not have doneD.Id rather have
9、 not done,C,11.I didnt hear the phone. I_asleep.A.must be B.must have beenC.should be D.should have been,B,12.Janny_have kept her word. I wonder why she changed her mind.A.must B.should C.need D.would,B,13.Tom ought not to_me your secret, but he meant no harm. A.have told B.tellC.be telling D.having
10、 told,A,14.-Could I borrow your dictionary?-Yes, of course you _.A.might B.will C.can D.should,C,15.-Shall we go skating or stay at home?-Which_do yourself.A.do you rather B.would you ratherC.will you rather D.should you rather,B,16.I told Sally how to get here, but perhaps I_for her.A.had to write
11、it out B.ought to write it outC.must have written it outD.should have written it out,D,17.The fire spread through the hotel very quickly but everyone_get out.A.had to B.would C.could D.was able to,D,18.When he was there, he_go to that coffee shop at the corner after work every day.A.would B.should C
12、.had better D.might,A,19.It is strange that he_such a silly thing.A.must have done B.may have doneC.could have done D.should have done,D,20.-_he turn up the radio? -Yes, please.A.Will B.Would C.Does D.Shall,D,21.-Jack fell off a ladder yesterday, but he is all right. -Hes lucky. He_himself badly.A.could wound B.would have woundedC.could hurt D.would wound,B,22.-Could I use your dictionary? - _.A.Please not B.Yes, you doC.No, you might not D.Please do as yours,D,23.-_the young man there be her cousin?-He_be, but Im not sure.A.Can; may B.May; wontC.Can; must D.will; dont,A,
