情态动词考点1：情态动词的基本用法1.表能力can可用于肯定句、疑问句、否定句could为can的或注：can和beableto表能力的区别can是指could是指---CouldIborrowyourdictionary?---Yes,ofcourseyouA.mightB.willC.canD.shouldveryquicklyThefirespreadthroughthehotelveryquicklybuteveryonegetout.A.hadtoB.wouldC.couldD.wasableto2.表可能性，意为“可能会，也许会”can、could、may、might---Excuseme.IsthistherightwaytotheSummerPalace?---Sorry,Iamnotsure.Butitbe.A.mightB.willC.mustD.canYoumightjustaswelltellthebossthatmalecustomernotlikethedesignofthefurniture.A.mustB.shallC.mayD.need---Ihavetakensomeoneelse’sgreensweaterbymistake.---ItHarry’s.Healwayswearsgreen.A.hastobeB.willbeC.mustn’tbeD.couldbe3.表请求、允许，意为“可以”can和could主要用于第二人称的句、句may主要用于第一人称的句表示征求对方的许可will主要用于第二人称的句would更委婉---Ihearyou’vegotasetofvaluableAustraliancoins.Ihavealook?---Yes,certainly.A.DoB.MayC.ShallD.Should---Willyoustayforlunch?---Sorry,.Mybrotheriscomingtoseeme.A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t4.表征求对方意见，意为“我们可以干某事吗？”Shall主要用于第一人称的句---Theroomissodirty.wecleanit?---Ofcourse.A.WillB.ShallC.WouldD.Do5.表意愿，决心，习惯性，倾向性will,would(表过去的意愿和过去常常做某事)waterwillboilat100℃.100度时水就会沸腾了。Shecometothezoo,becauseshewasafraidoftheanimals.A.wouldn’tB.couldn’tC.won’tD.mustn’tHecometoseemeonSundaywhenhewasinBeijing.A.wouldB.mayC.willD.must6.表义务，“应该”should表从说话人的个人看法这一角度oughtto表从道义上的责任Youarehermother,soyoulookafterher.Weencouragehimforheisourclassmate.7.表必要性need表必要，主要用于句和句中，needn’t不必要must表必须，一定，mustn’t表Tom,youleaveallyourclothesonthefloorlikethis!---Lucydoesn’tmindlendingyouherdictionary.---She.I’vealreadyborrowedone.考点2.情态动词表推测的用法1.在肯定句中有把握的推测用，意为对目前动作的推测用，对已发生的事情的推测用2.在肯定句中表对现在把握不大的推测用或（更小）对目前动作的推测用，对已发生的事情的推测用3.在肯定句中用表根据事物内在发展规律，事情发展的必然性得出的结论“某事应该发生”4.在肯定句中和表理论上或逻辑上的可能性。5.在否定句中对现在表推测用，对过去表推测用，在疑问句中，对现在表推测用，对过去表推测用。表可能性层次大小›››››He____havecompletedhiswork;otherwise,hewouldn’tbeenjoyinghimselfbytheseaside.A.shouldB.mustC.wouldn’tD.can’tIwasonthehighwaywhenthiscarwentpastfollowedbyapolicecar.They____atleast150kilometersanhour.A.shouldhavebeendoingB.musthavebeendoingC.couldhavedoneD.wouldhavedoneHelen____goonthetripwithus,butsheisn’tquitesureyet.A.shallB.mustC.mayD.can考点3.情态动词完成体的用法1.表对过去的推测musthavedone只能用于________句，表示______________________意为：_______________________may/mighthavedone只能用于________句，表示_________________意为：_______________________could/canhavedone只能用于________句和________句,分别表示对过去事情否定或疑问的推测。2.表本可以……但是……should/oughttohavedone意为：_______________________其否定形式为：_______________________意为：_______________________may/mighthavedone意为：_______________________其否定形式为：_______________________意为：_______________________couldhavedone用于________句,意为：_______________________needhavedone用于________句,意为：_______________________---Tomgraduateedfromcollegeataveryyoungage.---Oh,he____havebeenaverysmartboythen.A.couldB.shouldC.mightD.mustMr.White____at8:30forthemeeting,buthedidn’tshowup.A.shouldhavearrivedB.shouldarriveC.shouldhavehadarrivedD.shouldbearriving
