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《《情態(tài)動詞havedone》PPT課件.ppt》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、情態(tài)動詞+havedone用法對過去已經(jīng)發(fā)生過的情況的推測判斷Musthavedone,語氣較強，意思是“一定……、肯定……”Itmusthaverainedlastnight,forthegroundiswetthismorning.Can/couldhavedone,can’t/couldn’thavedone,可能，不可能，can的語氣比could強Hecan’thavegoneabroad;Isawhimanhourago.---Canhehavepassedtheexam?---No,hecan’thave.Hedidn’tworkhard.
2、may/mighthavedone，也用于對已經(jīng)發(fā)生過的情況的推測判斷，但語氣稍弱，意思是“可能，或許……”Shedidn’tgetthereintime.Shemayhavemissedthebus.Hedidn’tcometoschoolyesterday.Hemighthavebeenill.在虛擬條件句中1,與現(xiàn)在事實相反條件句用過去式，主句用should/would/could/might+動詞原形IfIwereyou,Iwouldgothere.IfIknewhisphonenumber,Iwouldringhimnow.2,與將來事實相反
3、，條件句用過去式，should+動詞原形，wereto+動詞原形，主句用should/would/could/might+動詞原形Ifitsnowedtomorrow,ourplanwouldbeputoff.（明天很可能不會下雪，計劃也不會延期）Ifweshouldcometomorrow,wecouldmeethim.(明天很可能不來，也見不著他)Ifthesunweretoriseinthewest,Iwouldchangemymind.3,與過去事實相反條件句用had+過去分詞，主句用should/would/could/might+have+
4、過去分詞IfIhadknownthatyouwerecoming,Iwouldhavepickedyouupattheairport.Ifwehadhadenoughrainlastyear,wecouldhavegainedagoodharvest.can/couldhavedone表示“本來能夠做而實際上沒有做的事情”Youcouldhavecomeherealittleearlier.你本來可以早點來到這兒的。Shecouldhaveearnedalotofmoney.她本來可以掙一大筆錢的。should/oughttohavedone表示“本來
5、應(yīng)該做的，而實際上沒有做的事情”，其否定形式則表示“已經(jīng)做了不該做的事情”，含有責備的意思。Theflowershavedied.Ishouldhavewateredthemoften.（其實沒澆水）Yououghtnottohavetoldthemthetruth.（其實你告訴他們了）needn’thavedone表示“做了本來不必做的事情”，通常不用于肯定句。It’sonlyfiveminutes’walk.Weneedn’thavetakenataxi.Itiswarmtoday.Youneedn’thavewornyourcoat.1.---I
6、stayedatahotelwhileinNewYork.---Oh,didyou?You___withBarbara.(NMET98)A.couldhavestayB.couldstayC.wouldstayD.musthavestay2.YesterdayJanewalkedawayfordiscussion,otherwise,she___somethingshewouldregretlater.(96上海)A.hadsaidB.saidC.mightsayD.mighthavesaid1.Ididn’thearthephone.I____asl
7、eep.(NMET89)A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen2.---Irangyourhomeyesterday.AmanansweredbutIdidn'trecognizethevoice.---On,it___mybrother,Peter.A.mustbeB.musthavebeenC.canhavebeenD.mightbeYesterday,Janewalkedawayfromthediscussion.Otherwise,she___somethingshewouldregre
8、tlater.(1996上海)A.hadsaidB.saidC.mightsayD.might
