初中情态动词1PPT课件

.,情态动词专项练习,BySteven,.,1.must,Youmustcomeintime.1)表示必须、必要。是说话人的主观看法在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt,donthaveto（不必）.-Mustwehandinourexercisebookstoday?-Yes,youmust.-No,youdonthaveto/youneednt.,.,1.must,YoureTomsgoodfriend,soyoumustknowwhathelikesbest.2)表示推测、可能性（只用于肯定的陈述句）,.,1.(13江西)TheresonlyonedaytoGo.You_finishyourworkbyTomorrow.canB.willC.mustD.may2.(11江苏)FiftydollarsforaT-Shirt!You_bejoking!A.mustB.needC.mayD.can,.,Mightandmay,表示请求和允许。might比may语气更委婉，而不是过去式否定回答时可用cant或mustnt，表示“不可以，禁止”。-Might/MayIsmokeinthisroom?-No,youmustnt.-May/MightItakethisbookoutoftheroom?-Yes,youcan.(No,youcant/mustnt.)用MayI.？征徇对方许可时比较正式和客气，而用CanI.？在口语中更常见。,.,2）用于祈使句，表示祝愿。,Mayyousucceed!,(13河北)_IseeyourIDcard,sir?Wehavetocheckyourinformation.A.MayB.MustC.ShouldD.Need,.,3)表示推测、可能性（不用于疑问句）。,might不是过去式，它所表示的可能性比may小。1Hemay/mightbeverybusynow.2Yourmothermay/mightnotknowthetruth.,.,2.(11安徽)MayIgooutnow,Dad?-No.You_letyourmotherknowFirst.canB.mayC.needD.must3.(13年湖北)MustIgotherewithYou?-No,you_.David_gotherewithyou.mustnt;canB.cant;mustC.dont;shouldD.neednt;may,.,三、can,could,Canyouliftthisheavybox?（体力）Marycanspeakthreelanguages.（知识）Canyouskate?（技能）1)表示能力（体力、知识、技能）。,.,此时可用beableto代替。Can只有一般现在时和一般过去式；而beableto则有更多的时态。Illnotbeabletocomethisafternoon.当表示“经过努力才得以做成功某事”时应用beableto，不能用Can。如：Hewasabletogotothepartyyesterdayeveninginspiteoftheheavyrain.,.,2)表示请求和允许。,-CanIgonow?-Yes,youcan./No,youcant.此时可与may互换。在疑问句中还可用could,might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。-CouldIcometoseeyoutomorrow?-Yes,youcan.(No,Imafraidnot.),.,3)表推测可能性。,肯定句中：can表示理论上的可能性；may表示事实上的可能性，如：InYuyao,sometimesitcanbereallycold.Tommaygocampingwithustomorrow,butheisnotsure.否定句和疑问句中，只能用can表猜测可能性。Someoneisknockingatthedoor,andwhocanitbe?ItcantbeTombecausehehasgonetoBeijing.,.,1.(13北京)-_yousinganEnglishsong?-Yes,IcanCanB.MayC.MustD.Need2.(13福建)-IsthatgirlSusan?-It_beher.SheleftforBeijingyesterday.needntB.cantC.mustnt,.,四、shall,shall用于第一人称，征求对方的意见。Whatshallwedothisevening?shallIcleantheroomforyou?,.,2)shall用于第二、三人称，表示说话人给对方的命令、警告、允诺或威胁。1.Youshallfailifyoudontworkhard.(警告)2.HeshallhavethebookwhenIfinishit.(允诺)3.Heshallbepunished.(威胁),.,五.should,表示“应该”，常用来表示劝告、建议；认为“某人应该做某事”或“有义务责任做某事”。Weshouldobeytrafficlaws.YoushouldntwatchTVeveryday。Youshouldnthavemadethiskindofsillymistakes.Tomshouldhavebroughthisreporttoday.这时它可以和oughtto，besupposedto互换使用,.,2)Should(oughtto)表示推测时，是指有一定根据的推测，意为“可能、该”,-WhencanIcomeforthephotos?Ineedthemtomorrow,-They_bereadyby12:00,.,3.表示惊讶的语气,Youcanneverimaginesuchagentlemanshouldbesorudetoalady.,.,(11浙江)Schools_allowstudentsatleastonehouradayforsports.wouldB.mightC.should2.(13江苏)-_IdothelaundryFirst,Mum?-No,you_.Youcandoyourhomeworkfirst.Must;mustntB.Can;mustntC.Must;needntD.May;neednt,.,六：will和would,1)表示意志或意愿：决心，愿意，Wewilldoourbesttosavethechild.我们会尽力抢救这个孩子。Itoldhertostopcrying,butshejustwouldntlisten.我叫她别哭,可她就是不愿听。,.,2)表示请求、建议或征求对方意见时，用Wouldyou?比用Willyou?更婉转。如：,Will/Wouldyoupleasekeepthedooropen?请让门开着好吗？Will/Wouldyougowithme?你愿意和我一起去吗?,.,相关情态动词,wouldlike表示愿意Iwouldliketohaveawordwithyou.我想同你说句话。wouldratherthan宁愿也不愿Iwouldratherfailthancheatintheexamination.我宁愿考不及格，也不愿意考试作弊。,.,七。need,1need作情态动词无人称或数的变化，后接动词原形，多用于否定句和疑问句中。如：Youneedntworry.你不必担心Ineednthavebroughttheraincoatwithmeinsuchasunnydayyesterday.,.,2由need引出的一般疑问句，肯定回答常用must或haveto;否定答语常用neednt.如：,NeedIanswerthequestion?我需要回答那个问题吗？Yes,youmust.-Yes,youhaveto.是的，你必须回答。-No,youneednt./youdonthaveto不，不必了。,.,由must引出的一般疑问句，肯定回答用must,否定答语用neednt或donthaveto。如：,MustIdotheworknow?我必须现在干这个活吗？Yes,youmust/haveto.-No,youneednt/donthaveto.,.,Need做行为动词,NeedsthNeedtodosthNeeddoing=needtobedone表被动否定：dontneed,.,八：dare敢,通常用于疑问句、否定句或条件句中Dareyouaskhim?你敢问他吗？Shedarenotgooutalone.她不敢单独出去。Idontknowwhetherhedaretry.我不知道他敢不敢试。,.,注意：,1.有过去式dared。如：Noonedaredspeakofit.没有人敢提及此事。2.Howdareyou/he/she/they?表示说话人对某人的行为表示愤慨。如：Howdareyouaskmesuchaquestion?你怎敢问我这样的问题?3.Idaresay表示“我相信，我认为，可能”。如：Idaresayyouareright.我认为你是对的,.,作行为动词：可用于各种句子中；在疑问句或否定句中，to经常被省略。如,Didanyonedare(to)admitit?有人敢于承认吗?Hedidnotdare(to)leavehiscarthere.他不敢把车停放在那里。IfhedarestoshowupatherhouseIllbesurprised.如果他敢出现在她的房子里，我会感到吃惊。,.,注意点一：,表推测可能性：must,can,may,might,cant,couldnt-Iheardtheywentskiinginthemountainslastwinter.-it_truebecausetherewaslittlesnowwhere.,.,二、表推测的用法,1.musthavedone过去肯定做了某事Sincetheroadiswet,itmusthaverainedlastnight.不存在mustnthavedone的形式。其否定或疑问形式须用can(could)来表示.例如：Hecanthavemissedtheway.Idrewhimamap.“Thedictionaryhasdisappeared.Whocouldhavetakenit?”,.,may/mighthavedone,Icantfindmykeys.Imay/mighthaveleftthemattheschoolyesterday.我找不到我的钥匙了。我可能昨天把他们落在学校了。Johnma