课件高一unit14 festivals.ppt

太原育英中学夏冰,情态动词must，haveto，havegotto的用法,你去睡一觉。2.你邀请他。3.你照你父母的话办。4.你抽这么多的烟。,Youdbettergetsomesleep.,Youdbetternotinvitehim.,Youshoulddowhatyourparentstellyou.,Yououghtnttosmokesomuch.,最好,最好不,应该,不应该,必须,不许,不得不,不必要,Youmustgetsomesleep.,Youmustntinvitehim.,Youhavetodowhatyourparentstellyou.,Youhaventgottosmokesomuch.,Modelverbs(),must,haveto,havegotto,mustnot/mustnt,donthaveto,haventgotto/hasntgotto,Mustsb?,Do/Doessb.haveto?,Have/Hassb.to?,（必须、应当）,（必须、不得不）,表示义务、命令或必要，后面接不还to的动词学定式。Soldiersmustobeyorders.Wemustkeepourword.2.must用在否定句结构中表示“不允许、禁止”Hemustnotleavehisroom.Youmustntsmokeintheoffice.3.must用在一般疑问句中，肯定回答用must，否定回答用neednt或donthavetoMustIhanditinbeforefive?No,you_.Yes,you_.,youneednt./donthaveto,youmust,must的用法,haveto和havegotto的用法,haveto由have+to组成。因此具有have的各种时态。Heisaninvalidandhastohaveanurse.Sheknewwhatshehadtodo.Ishallhavetoreconsidermyposition.Heisalwayshavingtoexercisejudement.2.在口语中，havegotto也可以表示义务和需要，与haveto基本同义。Hehasgottogorightnow.Hehasntgottogojustyet.,must和haveto的区别,含义不同：must表示说话人的主观思想，强调个人意志和主观的决心。haveto侧重于客观上的必要，强调客观条件作用的结果。Youmustdoitnow.Ihavetogonow.,3.否定含义不同在否定句中,haveto表示不需要，must则表示不允许。Youdonthavetogothere.Youmustntgothere.,2.适用时态不同must只能用于一般现在时和一般过去时，（在间接引语中）haveto可用于更多的场合。ShesaidshemustdowellinherEnglish.,Exercises,Dontbelateagain.You_behereontime.A.mayB.canC.mustD.needntYou_doitevenifyoudontwantto.A.cantB.mustntC.needntD.haveto3.MustItakeabus?No,you_.Youcanwalkfromhere.A.mustntB.dontC.donthavetoD.hadbetternotto4.Itisrathercoldhere.Shallwelight