情态动词用法+have_done.ppt

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1、ModalVerbsLet’sLearn情态动词＋havedonecan/could/may/mighthavedone都表示对过去所发生的事情的推测。意为“也许／可能已经”。She’stwohourslate.whatcan/couldhavehappened?(2)could/mighthavedone还表示过去本能够／本可以做某事是而实际没有做，有时含有“责备”之意。Inmyview,theaccidentcould/mighthavebeenprevented.Youcould/mighthavetoldmeaboutitearlier.(3)could/mighth

2、avedone还表示过去本会发生某事而幸好没有发生。Youwerestupidtotryclimbingupthere.Youcould/mighthavekilledyourself.Youshouldn’thaverunacrosstheroadwithoutlookinground.Youmight/couldhavebeenknockeddownbyacar.(4)could/mighthavedone还用于虚拟语气中。表示“过去本会做某事”而没有做。2.musthavedone表示对过去所发生的事情的肯定推测,意为“肯定／一定做了或发生了某事”。只用于肯定句中。So

3、meonemusthaveopenedthecage—thelioncouldn’thaveescapedonitsown.Ididn’thearthephone.Imusthavebeenasleep.3.should/oughttohavedone表示过去本应该做某事而实际上没有做，含有“责备”之意。Theplant’sdead.MaybeIshouldhavegivenitmorewater.IknowIoughtnottohavetakenthemoney.Compare:(2)表示对过去所发生的事情的推测,意为“应该会”，“理应会”。It’seighto’clock

4、.Heshouldhavearrivedhere(shouldbehere)bynow.(3)有时表示对将来要发生的事情的推测。IshouldhavefinishedreadingitbyFriday.4.needn’thavedone表示过去本不需要做某事而实际上做了。Therewasplentyoftime.Ineedn’thavehurried.(ButIhurried.)1.SorryI'mlate.I_____haveturnedoffthealarmclockandgonebacktosleepagain.A.mightB.shouldC.canD.will2.P

5、eter_____comewithustonight,butheisn’tverysureyet.A.mustB.mayC.canD.will3.Somepeoplewhodon’tliketotalkmucharenotnecessarilyshy,theyjustbequietpeople.A.mustB.mayC.shouldD.would4.Liza___wellnotwanttogoonthetrip---shehatestraveling.（2008全国II）A.will    B.can    C.must   D.mayABBD5.Michael____bea

6、policeman,forhe’smuchtooshort.A.needn’tB.can’tC.shouldD.may6.----IstayedatahotelwhileinNewYork.----Oh,didyou?You____withBarbara.A.couldhavestayedB.couldstayC.wouldstayD.musthavestayed7.MysistermethimattheGrandTheateryesterdayafternoon,sohe____yourlecture.A.couldn’thaveattendedB.needn’thavea

7、ttendedC.mustn’thaveattendedD.shouldn’thaveattendedBAAThankyou!