高中英语情态动词ppt课件.ppt

语法专题,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/beableto,2may/might,3must/haveto,4shall/should,5will/would,6need/dare,7oughtto,1can/could/beableto,1Someofuscanusecomputersnow,butwecouldntlastyear.（能力）2Itwillbesunnyinthedaytime,butitcanrainlateronthisevening（客观可能性）3-CanIgonow?yes,youcan（请求和允许）4Couldyouwaitafewdaysforthememory?（请求）51Canthisnewsbetrue?2Itcantbeourheadmaster.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.cantB.couldntC.maynotD.mightnot,2.Thefirespreadthroughthehotelveryquicklybuteveryone_getout.A.hadtoB.wouldC.couldD.wasableto,A,D,3.Theywill_runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beableto,D,2may/might,1MayIwatchTvaftersupper?Yesyoumay/No,youmustnt.（请求许可)2Itmaybetrue./shemaycometomorrow/Hemighthavesomefever（推测）3Mayyousucceed!Mayyouhavemanymoredaysashappyasthisone（祝愿）,may/mightaswell还是-好wemayaswellstaywhereweare,5.CouldIborrowyourdictionary?Yes,ofcourseyou_.A.mightB.willC.canD.should6.MightIwatchTVaftersupper?Yes,you_.A.mayB.mustC.mightD.can,C,A,3must语haveto的用法,1Youmustcometoschoolontime.Youmustntwasteanymoretime（必须,禁止）,2MustIcomebackbeforeten?Yes,youmust.No,youneednt./donthaveto,3Itmustbeourheadteacher.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,isnt,dont,hasnt,didnt,另外must还有偏偏一定要的意思whymustyouplaythepianowhileothersaresleeping.,7.You_returnthebooknow.Youcankeepittillnextweekifyoulike.A.cantB.mustntC.needntD.maynot8.Johnny,you_playwiththeknife,you_hurtyourself.A.wont;cantB.mustnt;mayC.shouldnt;mustD.cant;shouldnt,C,B,9.-Willyoustayforlunch?-Sorry,_.Mybrotheriscomingtoseeme.A.ImustntB.IcantC.IneedntD.Iwont10.-MayIpickaflowerinthegarden?-_.A.No,youneedntB.Not,please.C.No,youmustntD.No,youwont,B,C,4shall与should,1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Theyshouldhavearrivedbytwooclock,5用于if条件句表示万一AskTomtoringmeupifyoushouldseehim.ShoudIbefreetomorrow,Iwillcome.,6表竟然Idontknowwhyyoushouldbesorudetoyourmother,Tomsfatherpromised,“You_haveanewcomputerifyoupassthecomingexamination,”A.canB.shouldC.shallD.may,C,-WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-They_bereadyby12:00.(A.canB.shouldC.mightD.need,B,YououghttohavehelpedhimwithhisEnglish,_you?A.wontyouB.oughtnotyouC.shouldntyouD.wouldntyou,C,5will与would的用法,1表示意志和意愿Iwillneverdoitagain.Theysaidthattheywouldhelpus.,2表请求，建议Willyoupleasetakeamessageforme?Wouldyoupleasepasshimthebook?,3表功能Thismachinewontwork.,4表示习惯性动作与usedto有何区别Fishwilldiewithoutwater.Everyevening,hewouldsitbythewindow.,6need语dare的用法,既可做实意动词又可做情态动词。做情态动词用于否定和疑问句而做实意动词可用于肯定，否定疑问,Howdareyousaysuchathing?Howdareyoutosaysuchathing?,HedarenttospeakEnglishbeforesuchacrowd,didhe?HedarentspeakEnglishbeforesuchacrowd,darehe?,She_outaloneatnight.()A.darenottogoB.daresnotgoC.doesntdaretogoD.doesntdaresgo,C,7oughtto的用法,1表应该与should的区别Yououghttotakecareofhim.Youarehisfather.Yououghttogethimtoreceivegoodeducation,2表推测Heoughttobehomebynow.Hemustbehomebynow.,一情态动词+完成时表对过去的推测1musthavedone（仅用于肯定句)2cant/couldnthavedone(用于否定疑问句）3mayhavedone（肯定，否定均可)4mighthavedone（肯定，否定均可),二表虚拟1should/could/would/mighthavedone,三neednthavedonewouldratherhavedonehadbetterhavedone,Jenny_withhimatthattime,forIwashavingdinnerwithherinmyhome.()A.canthavebeenB.mustnthavebeenC.mustbeD.maybe,A,TheyaredisappointedattheEnglishparty.Theysaythatit_betterorganized.()A.hadbeenB.hadtobeC.musthavebeenD.couldhavebeen,D,24,-Didyouwalkedhomebyyourselflastnight?-Yes,Idid.ButIthinkI_.()A.needntB.shouldntC.maynothaveD.neednthave,D,25,8.We_lastnight,butwewenttotheconcertinstead.A.musthavestudiedB.mightstudyC.shouldhavestudiedD.wouldstudy9.Therewasplentyoftime.She_.A.mustnthavehurriedB.couldnthavehurriedC.mustnthurryD.neednthavehurried10.Yesterday,Janewalkedawayfromt