情态动词的用法情态动词的用法情态动词的基本用法特点1）情态动词除ought和have外，后面只能接动词原型。2）情态动词没有人称，数的变化，即情态动词第三人称单数不加-s。3）情态动词没有非谓语形式，即没有不定式，分词，等形式。高中阶段都学过哪些情态动词呢1can/could/beableto2may/might3must/haveto4shall/should5will/would6need/dare7oughtto1can/could/beableto1Someofuscanusecomputersnow,butwecouldn'tlastyear.（能力）2Itwillbesunnyinthedaytime,butitcanrainlateronthisevening（客观可能性）3---CanIgonow?yes,youcan（请求和允许）4Couldyouwaitafewdaysforthememory?（请求）51Canthisnewsbetrue?2Itcan'tbeourheadmaster.hehasgonetoBeijing.（表推测，主要用于否定和疑问）*beableto能用于各种时态。can/could只能表示现在或过去的能力。*was/wereableto:“设法做成某事”相当于managedtodosth.succeededindoingsth.。1.can与beableto有何区别？1.Acomputer______thinkforitself;itmustbetoldwhattodo.A.can’tB.couldn’tC.maynotD.mightnot2.Thefirespreadthroughthehotelveryquicklybuteveryone______getout.A.hadtoB.wouldC.couldD.wasabletoAD3.Theywill______runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beabletoD2may/might1MayIwatchTvaftersupper?Yesyoumay/No,youmustn't.（请求许可)2Itmaybetrue./shemaycometomorrow/Hemighthavesomefever（推测）3Mayyousucceed!Mayyouhavemanymoredaysashappyasthisone（祝愿）may/mightaswell还是-----好wemayaswellstaywhereweare5.—CouldIborrowyourdictionary?—Yes,ofcourseyou_______.A.mightB.willC.canD.should6.—MightIwatchTVaftersupper?—Yes,you________.A.mayB.mustC.mightD.canCA3must语haveto的用法1Youmustcometoschoolontime.Youmustn'twasteanymoretime（必须,禁止）2MustIcomebackbeforeten?Yes,youmust.No,youneedn't./don'thaveto3Itmustbeourheadteacher.Youmustbehungryafteralongwalk.（推测)4Ireallymustgonow.Ihavetogonow,becausemymotherisinhospital.(不得不）Hemustbereading,____he?Youmustdoityourself,____you?Hemusthavegoneoverthearticle,______he?Itmusthaverainedlastnight,_____it?3、表推测语气的反意疑问句的构成isn’tdon’thasn’tdidn’t另外must还有偏偏一定要的意思whymustyouplaythepianowhileothersaresleeping.7.You______returnthebooknow.Youcankeepittillnextweekifyoulike.A.can’tB.mustn’tC.needn’tD.maynot8.Johnny,you______playwiththeknife,you______hurtyourself.A.won’t;can’tB.mustn’t;mayC.shouldn’t;mustD.can’t;shouldn’tCB9.--Willyoustayforlunch?--Sorry,_____.Mybrotheriscomingtoseeme.A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t10.--MayIpickaflowerinthegarden?--________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’tBC4shall与should1用于一，三人称疑问句表示征求对方的意见和向对方请示Shallthedriverwait?Whatshallwedonext?2用于二三人称陈述句表示命令警告，允诺，威胁以及法律条文规定Youshallgowithme/HeshallbepunishedYoushallhavethebookwhenIfinishitAllthechildrenshallgotoschoolattheageofseven.3表示劝告和建议Youshouldstudyhard.4表推测Theyshouldhavearrivedbytwoo'clock5用于if条件句表示万一AskTomtoringmeupifyoushouldseehim.ShoudIbefreetomorrow,Iwillcome.6表竟然Idon'tknowwhyyoushouldbesorudetoyourmotherTom’sfatherpromised,“You___haveanewcomputerifyoupassthecomingexamination,”A.canB.shouldC.shallD.mayC------WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-----They_____bereadyby12:00.(A.canB.shouldC.mightD.needB•YououghttohavehelpedhimwithhisEnglish,____you?•A.won’tyou•B.oughtnotyou•C.shouldn’tyou•D.wouldn’tyouC5will与would的用法1表示意志和意愿Iwillneverdoitagain.Theysaidthattheywouldhelpus.2表请求，...
