2012.5情态动词+have done用法及练习

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1、情态动词+havedone用法及练习1.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“肯定做了某事”；只能用在陈述句的肯定句中。Itmusthaverainedlastnight,fortheroadiswet.Thelightswereout.Theymusthavebeenasleep.2.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的推意为“不可能做了某事”；只能用在陈述句的否定句中。Hewaswithmelast

2、night.Hecan’t/couldn’thavegonetothetheatre.IsawMr.Wangjustnow.Hecouldn’thavegonetoBeijing.Can/Could…havedonesth?表示对过去或已经发生的行为或状态的怀疑.意为“可能已经…吗？”。用在疑问句中。Hedidn’tattendhissister’sbirthdayparty.Can/Couldhehaveforgottenit?3.couldhavedonesth.用于陈述句的肯定句中时是虚拟语气，表示

3、没有实现的可能性，意为“本来可以做，可能已经做”。有一种对过去为付诸实施的事情的惋惜。用于肯定句中Youcouldhavedonebetter,butyouweretoocareless.4.may/might（not）havedonesth表示对过去或已经发生的行为或状态进行推测意为“可能(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.5.Should/oughttoh

4、avedonesth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Youshouldhavecometothemeetingearlier.Yououghttohavedonethisexercise.Youshouldn’thavetoldherthetruth.Heoughtnottohavetreatedhisparentslikethat.6.needn’thavedonesth.表示做了“本来不必做的事didn’tneedt

5、odo表示“没有必要做而实际上也没有做的事“Youneedn’thavetakenataxihere,foritwasveryneartomyhouse.Ididn’tneedtocleanthewindows.Mybrotherdidit.7.hadbetterhavedonesth.用于事后的建议，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.Youhadbettern

6、othavescoldedher.8.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,butnowIwouldrathernothavedonethat.61.We____lastnight,butwewenttotheconcertinsteadA.musthaves

7、tudiedB.mightstudyC.shouldhavestudiedD.wouldstudy2.–WhydoesAliceknowsomuchaboutAngkorWat?--She____havebeenthere.A.mustB.oughtn’ttoC.mayD.can’t3.–TomcametoworklastFriday,butnoonehasseenhimsince.--___hehavehadanaccident?A.ShouldB.MustC.MightD.Could4.–What’s

8、thematterwithyou?--Oh,I’mnotfeelingwellinthestomach.I___somuchfriedfishjustnow.A.shouldn’teatB.mustn’thaveeatenC.shouldn’thaveeatenD.mustn’teat5.–Mom’sgift?She__havechosenabetteroneforme.–She__beveryhappytoknowit.A.