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语法专题情态动词的用法情态动词的基本用法特点1)情态动词除ought和have外,后面只能接动词原型。
2)情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。
3)情态动词没有非谓语形式,即没有不定式,分词,等形式。我们学过哪些情态动词呢1can/could/beableto2may/might3must/haveto4shall/should5will/would6need/dare7oughtto1can/could/beableto1Someofuscanusecomputersnow,butwecouldn'tlastyear.(能力)2Itwillbesunnyinthedaytime,butitcanrainlateronthisevening(客观可能性)3---CanIgonow?yes,youcan(请求和允许)4Couldyouwaitafewdaysforthememory?(请求)51Canthisnewsbetrue?2Itcan'tbeourheadmaster.hehasgonetoBeijing.(表推测,主要用于否定和疑问)*beableto
能用于各种时态。
can/could
只能表示现在或过去的能力。*was/wereableto:“设法做成某事”
相当于managedtodosth.succeededindoingsth.。1.can与beableto有何区别?1.Acomputer______thinkforitself;itmustbetoldwhattodo.A.can’tB.couldn’tC.maynotD.mightnot2.Thefirespreadthroughthehotelveryquicklybuteveryone______getout.A.hadtoB.wouldC.couldD.wasabletoAD3.Theywill______runthismachineontheirowninthreemonths.A.canB.couldC.mayD.beabletoD2may/might1MayIwatchTvaftersupper?Yesyoumay/No,youmustn't.(请求许可)2Itmaybetrue./shemaycometomorrow/Hemighthavesomefever(推测)3Mayyousucceed!Mayyouhavemanymoredaysashappyasthisone(祝愿)may/mightaswell
还是-----好wemayaswellstaywhereweare4.—CouldIborrowyourdictionary?—Yes,ofcourseyou_______.A.mightB.willC.canD.should5.—MightIwatchTVaftersupper?—Yes,you________.A.mayB.mustC.mightD.canCA3must语haveto的用法1Youmustcometoschoolontime.Youmustn'twasteanymoretime(必须,禁止)2MustIcomebackbeforeten?Yes,youmust.No,youneedn't./don'thaveto3Itmustbeourheadteacher.Youmustbehungryafteralongwalk.(推测)4Ireallymustgonow.Ihavetogonow,becausemymotherisinhospital.(不得不)6.You______returnthebooknow.Youcankeepittillnextweekifyoulike.A.can’tB.mustn’tC.needn’tD.maynot7.Johnny,you______playwiththeknife,you______hurtyourself.A.won’t;can’tB.mustn’t;mayC.shouldn’t;mustD.can’t;shouldn’tCB8.--Willyoustayforlunch?--Sorry,_____.Mybrotheriscomingtoseeme.A.Imustn’tB.Ican’tC.Ineedn’tD.Iwon’t9.--MayIpickaflowerinthegarden?--________.A.No,youneedn’tB.Not,please.C.No,youmustn’tD.No,youwon’tBC4shall与should1用于一,三人称疑问句表示征求对方的意见和向对方请示Shallthedriverwait?Whatshallwedonext?2用于二三人称陈述句表示命令警告,允诺,威胁以及法律条文规定Youshallgowithme/HeshallbepunishedYoushallhavethebookwhenIfinishitAllthechildrenshallgotoschoolattheageofseven.3表示劝告和建议Youshouldstudyhard.4表推测Theyshouldhavearrivedbytwoo'clock5用于if条件句表示万一AskTomtoringmeupifyoushouldseehim.ShoudIbefreetomorrow,Iwillcome.6表竟然Idon'tknowwhyyoushouldbesorudetoyourmother10.Tom’sfatherpromised,“You___haveanewcomputerifyoupassthecomingexamination,”A.canB.shouldC.shallD.mayC
11.------WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.-----They_____bereadyby12:00.(A.canB.shouldC.mightD.needB
12.YououghttohavehelpedhimwithhisEnglish,____you?A.won’tyouB.oughtnotyouC.shouldn’tyouD.wouldn’tyouC5will与would的用法1表示意志和意愿Iwillneverdoitagain.Theysaidthattheywouldhelpus.2表请求,建议Willyoupleasetakeamessageforme?Wouldyoupleasepasshimthebook?3表功能Thismachinewon'twork.4表示习惯性动作与usedto有何区别Fishwilldiewithoutwater.Everyevening,hewouldsitbythewindow.6need语dare的用法既可做实意动词又可做情态动词。做情态动词用于否定和疑问句而做实意动词可用于肯定,否定疑问Howdareyousaysuchathing?Howdareyoutosaysuchathing?Hedaren’ttospeakEnglishbeforesuchacrowd,didhe?Hedaren’tspeakEnglishbeforesuchacrowd,darehe?13.She_____outaloneatnight.()A.darenottogoB.daresnotgoC.doesn’tdaretogoD.doesn’tdaresgoC7oughtto的用法1表应该与should的区别Yououghttotakecareofhim.Youarehisfather.Yououghttogethimtoreceivegoodeducation2表推测Heoughttobehomebynow.Hemustbehomebynow.一情态动词+完成时表对过去的推测1musthavedone(仅用于肯定句)2can't/couldn'thavedone(用于否定疑问句)3mayhavedone(肯定,否定均可)4mighthavedone(肯定,否定均可)二表虚拟1should/could/would/mighthavedone三needn'thavedonewouldratherhavedonehadbetterhavedone14Jenny____withhimatthattime,forIwashavingdinnerwithherinmyhome.()A.can’thavebeenB.mustn’thavebeenC.mustbeD.maybe
A
15.TheyaredisappointedattheEnglishparty.Theysaythatit___betterorganized.()A.hadbeenB.hadtobeC.musthavebeenD.couldhavebeenD16.----Didyouwalkedhomebyyourselflastnight?----Yes,Idid.ButIthinkI_____.()A.needn’tB.shouldn’tC.maynothaveD.needn’thaveD17.We______lastnight,butwewenttotheconcertinstead.A.musthavestudiedB.mightstudyC.shouldhave
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