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1、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。高中阶段都学过哪些情态动词呢1can/could/beableto2may/might3must/haveto4shall/should5will/would6need/dare7oughtto1can/could/beableto1Someofuscanusecomputersnow
2、,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。c
3、an/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.
4、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!Mayy
5、ouhavemanymoredaysashappyasthisone(祝愿)may/mightaswell还是-----好wemayaswellstaywhereweare5.—CouldIborrowyourdictionary?—Yes,ofcourseyou_______.A.mightB.willC.canD.should6.—MightIwatchTVaftersupper?—Yes,you________.A.mayB.mustC.mightD.canCA3must语haveto的用法1Youm
6、ustcometoschoolontime.Youmustn'twasteanymoretime(必须,禁止)2MustIcomebackbeforeten?Yes,youmust.No,youneedn't./don'thaveto3Itmustbeourheadteacher.Youmustbehungryafteralongwalk.(推测)4Ireallymustgonow.Ihavetogonow,becausemymotherisinhospital.(不得不)Hemustbereading,_
7、___he?Youmustdoityourself,____you?Hemusthavegoneoverthearticle,______he?Itmusthaverainedlastnight,_____it?3、表推测语气的反意疑问句的构成isn’tdon’thasn’tdidn’t另外must还有偏偏一定要的意思whymustyouplaythepianowhileothersaresleeping.7.You______returnthebooknow.Youcankeepittillnextwee
8、kifyoulike.A.can’tB.mustn’tC.needn’tD.maynot8.Johnny,you______playwiththeknife,you______hurtyourself.A.won’t;can’tB.mustn’t;mayC.shouldn’t;mustD.can’t;shouldn’tCB9.--Willyoustayforlunch?--Sorry,_____.Mybrothe