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1、精讲点拨1.情态动词can,may和must情态动词和不带to的动词不定式一起构成谓语，但ought除外。情态动词有一定的词义，没有人称和数的变化。它表示说话人的语气或情态，如请求、命令、愿望、能力以及可能性等。情态动词含义示例一般疑问句回答can/could能；能够；会；可以Wecanbuyacartosaveourtimeontheroad.Canheswim?Yes,...can./No,…cant许可Youcan(-may)gohomenow./用于条件句中Ifhecomes,hecanhelpus.Icouldcomeearlier,ifnece
2、ssary./beableto与can同义，常用以表示can所不能表示的将来或完成时的概念Shewillbeabletobuythehousebytheendofnextyea匚Yes,...is(are).No,...isn't/aren^tmay/might允许、请求Excuseme,mayIhaveaglassofwater?Yes,...may/can.No，.・・can't/mustn't.可能，或许；用might语气更加不肯定Theseideasmayseemstrangetoyou.Hemightgetlost./表祝愿Mayallyourd
3、reamscometrue.must必须，应该Allthestaffmustarriveatthesquarebefore9.mustnot意为“不可以"，“不许"；而neednot才是must通常的否定回答Wemustnotspitontheground.・MustIreturnthebooknextweek?—Yes,youmust./No,youneedntExl:请选择最佳答案1.Iborrowyourdictionary?5'一-“Certainly,hereyouare]A.MustB.MayC.NeedD.Shall1.Youworryabo
4、uthim.Hewilltakecareofhimself.A.can'tB.needn^tC.mustn'tD.couldn't2.Wetalkorsleepintheclass,orMrs.Clarkwillbeveryangry.A.don'tB.haven'tC・needn'tD.mustn't3.■一youunderstandwhatImean?…Notreally.C.MustD.ShouldA.CanB.May4.—Let'sgodancingtonight.-一Sorry,I.Ihavetogotoameeting.A.maynotB.mu
5、stn^tC.can'tD.needn't5.—MustIparkmycarbehindthebuilding?■一No,you•Butyouparkithere.A.mustiTt,mayB.maynot,mustC.dorfthaveto,mayD・shouldn't，must6.Youbelateforschoolagainnexttime.A.mustn'tB.needn'tC.don'thavetoD.don'tneedto7.—MustIdomyhomeworkatonce?…No,you•C.can'tD.maynotA.needn'tB.m
6、ustn't2.can,may,must表猜测用法区别情态动词表示“猜测‘‘例句can表示可能性，常用于否定句表示“不可能=疑问句表示“会…吗？"Canitbetrue?那会是真的吗？Itcannotbetrue.may表猜测，通常只用于陈述句表示“可能，也许"Youmayberigh匸你可能是对的。must表猜测，暗含有很大的可能性表示“肯定，一定"Hemustbeill.Helookssopale.他肯定是病了。他的脸色那么苍白。Ex.2请选择最佳答案1•一・IsawJohnnyinthepublastnight.―Itbehim.HewenttoL・
7、A・andhewon，tbebackuntilnextweek.A.needn^tB.mustrft1.■一Whereismomnow?C・havetoD.carft一一I'mnotsure・Shebeinthekitchen.A.shallB.mayC.need2.―Whydidn'tTracycometoschooltoday?—Shebesick・Shedidn'tfeelwellyesterday・A.mustB.mightC.may二、课后练习一）单项选择1.…CanyouspeakJapanese?…SonyI•A.needn^tB.mustn
8、'tC.can'tD.maynot2.…IvisitLucyonS
