情态动词完成式一览表及练习

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1、“情态动词+havedone”用法一览表练习musthavedone表示对过去或已经发生的行为或状态进行确有把握的推测，意为“想必/一定/准是做了某事；只能用在陈述句的肯定句中。Itmusthaverainedlastnight,fortheroadiswet.Thelightswereout.Theymusthavebeenasleep.can’t/couldn’thavedonesth.表示对过去或已经发生的行为或状态进行确有把握的否定的推测，意为“想必/一定/准是没有做了某事；只能用在陈述句的否定句中。Hewaswithmelastnight.Hecan’t/couldn’thav

2、egonetothetheatre.IsawMr.Wangjustnow.Hecouldn’thavegonetoBeijing.couldhavedonesth.用于陈述句的肯定句中时是虚拟语气，表示没有实现的可能性，意为“本来能够做到“，而实际上没有做到。Youcouldhavedonebetter,butyouweretoocareless.Can/Could…havedonesth?用在疑问句中表示主观上的猜测只能用can/could的表达；表示对过去或已经发生的行为或状态的怀疑.“可能已经…吗？”“准是做了某事”等。Hedidn’tattendhissister’sbirthd

3、ayparty.Can/Couldhehaveforgottenit?may/might（not）havedonesth表示对过去或已经发生的行为或状态进行可能的推测为“也许/或许(没有)做了某事；只能用在陈述句的肯定和否定句中。It’stoolate.Ithinkhemayhavegonetobed.Hemightnothavefinishedthework.Should/oughttohavedonesth表示“本应该做…”而实际上没做Should/oughtnottohavedonesth.表示“本不应该做”而实际上做了Youshouldhavecometothemeetingea

4、rlier.Yououghttohavedonethisexercise.Youshouldn’thavetoldherthetruth.Heoughtnottohavetreatedhisparentslikethat.needn’thavedonesth.表示做了“本来不必做的事didn’tneedtodo表示“没有必要做而实际上也没有做的事“Youneedn’thavetakenataxihere,foritwasveryneartomyhouse.Ididn’tneedtocleanthewindows.Mybrotherdidit.hadbetterhavedonesth.用于

5、事后的建议，含轻微的责备的口吻，意为“当时最好做了某事“，其否定形式hadbetternothavedonesth表达相反的含义。Youhadbetterhavestartedearlier.Youhadbetternothavescoldedher.wouldratherhavedonesth表示“当时宁愿做了某事”其否定形式wouldrathernothavedonesth表示相反的含义，两者都表示“后悔的意思Iwouldratherhavetakenhisadvice.Iraisedobjectionsatthemeeting,butnowIwouldrathernothavedo

6、nethat.Exercise11.We____lastnight,butwewenttotheconcertinsteadA.musthavestudiedB.mightstudyC.shouldhavestudiedD.wouldstudy2.–WhydoesAliceknowsomuchaboutAngkorWat?--She____havebeenthere.A.mustB.oughtn’ttoC.mayD.can’t3.–TomcametoworklastFriday,butnoonehasseenhimsince.--___hehavehadanaccident?A.Shou

7、ldB.MustC.MightD.Could4.–What’sthematterwithyou?--Oh,I’mnotfeelingwellinthestomach.I___somuchfriedfishjustnow.A.shouldn’teatB.mustn’thaveeatenC.shouldn’thaveeatenD.mustn’teat5.–Mom’sgift?She__havechosenabetteroneforme.