Grammar情态动词ModalVerbs情态动词情态动词用来表示说话人对一个动作或状态的看法，态度或者说话人的情感。它有一定的意义，即：说话人认为某事“可能”，“或许”，“应该”，或是“必须”发生等。情态动词用法的特征：1.有一定的词义，但不能单独使用作谓语。2.适用于主语的各种人称和数（haveto例外）3.后面接动词原形。4.具有助动词的作用，既可用来构成否定句疑问句及简明答语。助动词：dodoes,have(done)willdidbecancouldbeabletomaymightmusthavetoshallshouldwillwouldoughttoneedhadbetter常用的情态动词：常用的情态动词：1)can的主要用法是：A.___________：eg.Thegirlcandanceverywell.HeisanativespeakerofEnglish,sohecanspeakEnglishquitewell.can和could：表示能力表示能力B._____________：eg.Canthenewsbetrue?Youcan’tbeserious.表示推测可能性表示推测可能性客观的可能性：Everybodycanmakemistake.疑问句和疑问句和否定句否定句1.Thereisnolighton---they___beathome.A.can’tB.mustn’tC.needn’tD.shouldn’t2.MyMP4playerisn’tinmybag.Where___Ihaveputit?A.canB.mustC.shouldD.would3.Aleft-luggageofficeisaplacewherebags____beleftforashorttime,especiallyatarailwaystation.A.shouldB.canC.mustD.will•C.________________:eg.CanIsithere?CanIleavenow?--CanIuseyourbiketomorrowmorning?--Yes,youcan.表请求或许可表请求或许可can的用法：A.A.表示能力；B.表推测，可能性C.表请求或许可2)could的主要用法是：A.__________________________________________________:eg.Weallknewthattheyoungmancouldn’tbeadoctor.couldcould是是cancan的过去式的过去式,,表示过去表示过去的能力和推测的能力和推测couldcould可代替可代替cancan表示请求表示请求,,语气委语气委婉婉eg.Couldyouopenthedoor?CouldIuseyourbike?B.B.3)eg.Theycan't/couldn’thavegoneoutbecausethelightisstillon.can’t/couldn’thavedonecan’t/couldn’thavedone过否猜过否猜mustdo/be现肯猜cant’tdo/be现否猜musthavedone过肯猜1.I____havebeenmorethansixyearsoldwhentheaccidenthappened.A.shouldn’tB.couldn’tC.mustn’tD.needn’t2.–Shelooksveryhappy.She___havepassedtheexam.--Iguessso.It’snotdifficultafterall.A.shouldB.couldC.mustD.might3.Helooksveryyoung,sohe____beastudent.A.mustB.canC.willD.maymay和might：may常用来表示：A._________________________eg.--__Istophere,sir?--No.Goontothenextparagraph,please.A.WillB.MayC.WouldD.OughtYoumaygonow.表示请求、允许;比can正式:B.________________________eg.--IbelievethemanisfromEngland.ButImaybewrong.表示猜测,推测Theroadmaybeblocked.这条路可能不通了。实际的可能性实际的可能性没把握的1.Peter____comeheretonight,butPeter____comeheretonight,butheheisn’tverysureisn’tverysureyet.yet.A.mustB.mayC.canD.willA.mustB.mayC.canD.willC._____________________eg.Mayyousucceed!Mayyouhaveagoodjourney!表示祝愿;语气较正式:may的用法：A.请求，允许B.推测，猜测C.祝愿might的用法有:Shesaidthathemighttakeherbike.她说他可以拿她的自行车去用。-IsthisTom’sbike?-Iamnotsure,butit___be.A.mightB.willC.mustD.canA.一般表示过去可能，也可用现在，比may更弱B.might+havedone表示对过去发生事情的没把握的判断。musthavedone过去肯定can’t/couldn’thavedone过去否定mighthavedone不确定--Whereismydictionary?IrememberIputithereyesterday.--You___itinthewrongplace.A.mustputB.shouldhaveputC.mightputD.mighthaveput--Johnisabscent(缺席）today.--He____havecaughtacold,butIamnotsure.A.canB.mightC.mustD.shouldmust的主要用法：A._________________eg:Wemustalldie.人总要死的。B._________________________Healwayscomesfirstinexams.Hemustworkveryhard.Yougetthefirstprize,andyoumustbeveryhappynow.表示必然性。表推测，判断，有把握的1.Incrowdedplaceslikeairpo...
