高一英语下情态动词ppt课件VIP

.,Grammar,情态动词,.,非推测性情态动词shall,will,must,mustnt,should,would的用法,情态动词could,should/oughtto,may/might,neednt+havedone表示假设的用法,情态动词must,can/could,may/might,should/oughtto表猜测的用法,情态动词的一些惯用法,.,表示推测情态动词的重要用法.,肯定的推测可能的推测否定的推测疑问的推测,must,对将来对现在对过去,情态动词,may,might,cant,couldnt,can,could,+V.+V.+havedone常见mustbe+bedoing,+V.+V.+havedone+bedoing可以用not表示“可能不”,+V.+V.+havedone+bedoing,+V.+V.+havedone+bedoing,.,Must+havedone表示对过去已经发生的行为进行推测，意为“想必/准是/一定作了某事”。,1.Wemusthavelearned2,000wordsbytheendoflastterm.到上学期为止我们一定学了有两千个单词。2.HemusthavegonetoBeijing.他一定已经去北京了。,.,can/could+havedone表示对过去的行为的怀疑和不肯定，通常用在否定句和疑问句中。,1.Cantheyhavewonthebasketballmatch?他们可能赢了篮球赛吗？2.ItcouldnthavebeenMr.Green.HehasgonetoNewYork.那不可能是格林先生的，他已经去北京了。,.,could(不用can)+havedone,在肯定句中表示“本来能够而没能”，具有婉转的批评和责备之意。,Youcouldhavetoldmeearlier.你本该早点告诉我的。,.,should/oughtto+havedone用于肯定句时，表示“本该做某事而实际上没做”，用于否定句时，则表示“不该做的事反而做了”。,1.Youshouldhavetoldhimaweekago.你本来应该在一周前告诉他的。,.,might（不用may）+havedone表示“本来可能”，但实际上没有发生的事。另外，还可表示“本来应该或可以做某事”之意，含有轻微的责备语气。,1.Youmightnothavetoldher.你本可以不告诉他的。（事实上你告诉他了）2.Youmighthavecomeearlier.你本可以早点来的。（但没有这样）,.,neednt+havedone表示做了本来不必去做的事。,1.Sheneednthavegonetothestationyesterday.昨天她本不必到火车站去的.（昨天她去了）2.Youneednthaveboughtit.你本可不必买它的。（你买了）,.,巩固练习,1.Oh,Imnotfeelingwellinthestomach.I_somuchfriedchickenjustnow.A.shouldnteatB.shouldnthaveeatenC.mustnteatD.mustnthaveeaten2.-WhyhasntJanearrivedyet?-She_againinthemorning?A.shouldnthaveoversleptB.mayhaveturnedoffthealarmclockC.musthavenoonetocallherD.shouldhavesomeonetowakeherup3.-Didyougotothemoviethedaybeforeyesterday?-No.We_,butwedecidednotto.A.shouldhavegoneB.couldgoC.shouldgoD.couldhavegone,B,B,A,.,4.Asitturnedouttobeasmallhouseparty,we_soformally.needntdressB.didnthavetodressupC.MightnothavedressedupD.neednthavedressedup5.Imrathersurprisedyouhaventreportedhimtoyourteacher.Inmyopinion,you_thisassoonasyoufoundouthewascheating.musthavedoneB.mighthavedoneC.shouldhavedoneD.couldhavedone,D,C,.,1.作为情态动词用，常用在否定句和疑问句中。,Dare(need)+S+VS+darent(neednt)+V,Idarentwalkthroughtheforestatnight.Dareyouwalkthroughtheforestatnight?Youneedntreturnthebooknow.Needhegoyesterday?,可兼做行为动词的情态动词：need、dare,.,2.作实义动词用，常用在肯定句中,有人称、时态、和数的变化,Heneedstogotherehimself.Hehasgrownup,wedontneedtoworryabouthim.,3.Sth(sb)need(want,request)+doing/tobedoneThehouseneedscleaning/tobecleanedTheboyneedssendingtothehospitalatonce.,.,句型时态动词情态动词dare实义动词dare肯定句现在时daredodare/darestodo过去时daredodaredtodo否定句现在时darent/darenotdodo/doesnotdare(to)do过去时darednotdodidnotdare(to)do疑问句现在时Darehedo?Doyou/Doeshedare(to)do?过去时Daredhedo?Didhedare(to)do?,.,2.Iwonderhowhe_thattotheteacher.A.daretosayB.daresayingC.notdaresayD.daredsay,D,4.Asitturnedouttobeasmallhouseparty,we_soformally.AneedntdressB.didnthavetodressupC.MightnothavedressedupD.neednthavedressedup,D,.,1.判断正误:,Howdareyousaysuchathing?Howdareyoutosaysuchathing?,HedarenttospeakEnglishbeforesuchacrowd,didhe?HedarentspeakEnglishbeforesuchacrowd,darehe?,Exercises,.,Nobodyneedtobeafraidofcatchingthedisease.Nobodyneedbeafraidofcatchingthedisease.,Thesedishesneedbecleanedcarefully.Thesedishesneedtobecleanedcarefully.Thesedishesneedcleaningcarefully.,.,hadbetter(最好),should(应该)与oughtto（应该）均为提建议、阐述观点的情态动词，其后接动词原形。should比hadbetter语气强，oughtto语气最强。一般情况下should与oughtto可通用。例1：你最好立即去那里。Youhadbettergothereatonce.例2：你应该努力工作。Yououghtto/shouldworkhard.,.,（一）否定句hadbetter,should,oughtto用于否定句时，否定词均位于其后，具体形式为：hadbetternotdo,shouldnt/shouldnotdo,oughtnttodo。例1此时你最好别出发。：Youhadbetternotstartatthistime.例2：她不应该浪费时间。Sheoughtnttowastetime.,.,（二）一般疑问句hadbetter,should,oughtto用于一般疑问句时，分别将had,should,ought提至句首。例1：他最好立即出发吗？Hadhebetterstartearlyatonce?例2：你应该这么做吗？Shouldyoudolikethis?例3：他应该去那里吗？Oughthetogothere?,.,（三）反意疑问句陈述句谓语动词含hadbetter,should,oughtto时，反意疑问句为：had,should与ought+主格人称代词或hadnt,shouldnt,oughtnt+主格人称代词。例1：你最好别回家，是吗？Youhadbetternotgohome,hadyou?例2：你应该认真学习，是吗？Youshouldstudyhard,shouldntyou?例3：你上课不应该讲话，是吗？Heoughtnttospeakinclass,oughthe?,.,1Theflowerisdead.I_ityesterday.AshouldwaterBmustwaterCshouldhavewateredDmustnthavewatered2WhattimeoughtI_?AarrivedBarrivingCarriveDtoarrive3He_speaktohismoth