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1、情态动词Modalverbs常用的情态动词can(could)may(might)shall(should)will(would)mustdare(dared)needhavetooughttobeabletousedto在情态动词的使用中,我们要注意以下考点:1.情态动词的基本用法。2.情态动词表推测的用法。3.情态动词+havedone的用法。1.表“能力”can,could的用法Ican/amabletoswim.Icould/wasabletoclimbatreewhenIwasachild.Iwillbeabletoswimnextweek.Thefirespreadthrought
2、hehotelveryquicklybuteveryonewasabletogetout.1.can表示现在的能力2.could表示过去的能力3.beableto表能力,可用于多种时态4.beableto强调成功地做了某事2.表“请求,许可”could用来表示请求的时候比can更委婉CanyouhelpmewithmyEnglish?HesaidIcouldborrowhisbike.CouldIuseyourbike?—CouldIborrowyourdictionary?—Yes,ofcourseyou____.A.mightB.willC.canD.should3.表“可能性”can,c
3、ould用在肯定句中表示理论上的可能性,“经验之谈”Asahumanbeing,anyonecanmakeamistake.can,could用在疑问句中表推测,表示可能性Canshebeintheclassroom?can,could用在否定句中表推测,翻译成“不可能”Wethoughtthestorycouldn’tbetrue.1.Mary____beinParis,forIsawherinthetownonlyafewminutesago.A.mustn'tB.can'tC.shouldn'tD.maynot2.MyMP4playerisn’tinmybag.Where____Ihav
4、eputit?A.canB.mustC.shouldD.would1.表“询问”(might比用may更客气.)MayI…?(=CanI…?)MightI…?(=CouldI…?)MayIborrowyourbook?may与might用法—MayIpickaflowerinthegarden?—________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’t注意:mayI…?的答语.肯定:Yes,youmay.否定:No,youmustn’t(语气强硬)No,youmaynot.或No,you’dbetternot.2.表“许
5、可”YoumaytaketheboythereHesaidthatImightusehistelephone.—MightIwatchTVaftersupper?—Yes,you________.A.mayB.mustC.mightD.could3.表推测,表示主观上的推测,“可能,也许”,不用于疑问句,might比may的可能性更小Shemaynotlikethisplace.I’mafraidhemightnotlikethisplace.Peter____comewithustonight,butheisn’tverysureyet.A.mustB.mayC.canD.will1.mus
6、t表示主观上的必须,应该,没有时态变化。YoumustdoeverythingasIdo.注意:—MustIfinishmyhomeworktoday?—Yes,youmust.—No,youneedn’t./No,youdon’thaveto.must的用法“必须、不得不”must表示的是说话人的主观看法。haveto表示的是客观需要。(是由于某种外界(客观)原因而“必须”,“不得不”做某事,也可表示经常的或习惯性的事“必须”做。)Ihavetobeatmyofficeeveryevening.注意:1.haveto的否定形式don’thaveto表示不必。2.haveto可用于多种时态中
7、。1.Incrowdedplaceslikeairportsandrailwaystations,you___takecareofyourluggage.A.canB.mayC.mustD.will2.—Musthecometosignthispaperhimself?—Yes,he _______.A.need B.mustC.may D.will2.must表示肯定的推测。