高一英语必修三Unit2Grammar课件.ppt

Grammar,Modalverbs情态动词(II),Unit2Healthyeating,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.,OurcolorTVsetisstillgoodenough.Youneednthaveboughtanewone.,4.neednthavedone表示原本不必要做的事情却已经做了的情况,意为“本不必要”,Yourhomeisnotfarfromyourschool,soyouneednthaveleftinsuchahurrythen.,5.注意对need问句的回答:-NeedIfinishtheworktoday?-Yes,_.No,_.No,_.,youmust,youneednt,youdonthaveto,-Mustwedoitnow?-No,you_.,neednt(donthaveto),情态动词的其他用法,maywell+v=havegoodreasonto(理所当然）Youmaywellsayso.may/mightaswell=hadbetterdo.(最好。）Youmayaswellsayso.mayaswell+v.+as+v(与其.不如.)(最好.而不要.）Youmightaswellthrowyourmoneyawayaslendittohim.,1.may,1.Judgingfromhisaccident,hemustbefromthesouth,2.Itiselevenoclockatnightandthelightsareoff.Theymustbesleepingnow,isnthe?,arentthey?,因must后是系动词be,must后接的是besleeping，是对正在进行的情况推测,2.与must有关句子的反意疑问句,1.Wemusthavelearned2,000wordsbytheendoflastterm,hadntwe?,3.HemusthavegonetoBeijing,didntit?,hasnthe?,若句中含有过去完成时的时间状语，用过去完成时完成反意疑问句,若句中含有过去的时间状语，用一般过去时完成反意疑问句,若句中不含任何时间状语，用现在完成时完成反意疑问句,2.Itmusthaverainedlastnight,fortheroadwasverymuddy，,.cannotbut+dosth表示“不得不，只好”。Icannotbutadmireyourbravery.我不得不钦佩你的勇气。Icouldnotbutchoosetogo.我只好去。,3.can,1.判断正误:,Howdareyousaysuchathing?Howdareyoutosaysuchathing?,HedarenttospeakEnglishbeforesuchacrowd,didhe?HedarentspeakEnglishbeforesuchacrowd,darehe?,Exercises,Nobodyneedtobeafraidofcatchingthedisease.Nobodyneedbeafraidofcatchingthedisease.,Thesedishesneedbecleanedcarefully.Thesedishesneedtobecleanedcarefully.Thesedishesneedcleaningcarefully.,1.Therewasalotoffunatyesterdaysparty.You_come,butwhydidntyou?A.musthaveB.shouldC.needhaveD.oughttohave,D,2.Iwonderhowhe_thattotheteacher.A.daretosayB.daresayingC.notdaresayD.daredsay,D,3.Chinesemusthavethelargestnumberofspeakers,_.A.mustnttheyB.haventtheyC.donttheyD.didntthey,C,4.Asitturnedouttobeasmallho