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1、情态动词用法归纳情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语Should/oughttodare/need情态动词+havedone用法总结1)should,oughtto表示“应该”,oughtto表示义务或责任,比should语气重。1.Ishouldhelpherbecausesheisintrouble.2.Yououghttotakecareofthebaby.2)表示劝告、建议和命令。should,oughtto可通用,但在疑问句中常用should。1.Youshould/o
2、ughttogotoclassrightaway.2.ShouldIopenthewindow?should,oughtto3)表示推测should,oughtto(客观推测),must(主观推测)。1.Hemustbehomebynow.(断定他已到家)2.Heoughtto/shouldbehomebynow.(不太肯定)3.Thisiswheretheoilmustbe.(直爽)4.Thisiswheretheoiloughtto/shouldbe.(含蓄)should,oughttodare,need1
3、)dare作情态动词用时,常用于疑问句、否定句和条件从句中,过去式形式为dared。1.HowdareyousayI’munfair?2.Hedaren’tspeakEnglishbeforesuchacrowd,darehe?3.Ifwedarednotgotherethatday,wecouldn’tgetthebeautifulflowers.2)need作情态动词用时,常用于疑问句、否定句。在肯定句中一般用must,haveto,oughtto,should代替。1.Youneedn’tcomesoea
4、rly.2.----NeedIfinishtheworktoday?----Yes,youmust./No,youneedn’t.dare,need3)dare和need作实义动词用时,有人称、时态和数的变化。在肯定句中,dare后面常接带to的不定式。在疑问句和否定句中,dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。1.Idaretoswimacrossthisriver.2.Hedoesn’tdare(to)answer.3.Heneedstofinishhishomewor
5、ktoday.“情态动词+havedone”结构用法小结“情态动词+havedone”结构用法小结课文原句:1.tellhim/herthathe/sheshouldhavestudied,…2.FrederickWilliamⅠ,thekingofPrussia,couldneverhaveimaginedthathisgreatestgifttotheRussianpeoplewouldhavesuchanamazinghistory.重庆市垫江中学周洋“情态动词+havedone”结构用法小结考题感知:1
6、.She___haveleftschool.Forherbikeisstillhere.(天津·6)A.can’tB.wouldn’tC.shouldn’tD.needn’t“情态动词+havedone”结构用法小结2.–Ican’tfindmypurseanywhere.–You___havelostitwhileshoping.(重庆·30)A.mayB.canC.shouldD.would“情态动词+havedone”结构用法小结3.Whatapity!Consideringhisabilityandex
7、perience,he___better.(江西·26)A.needhavedoneB.musthavedoneC.canhavedoneD.mighthavedone“情态动词+havedone”结构用法小结考题感知:1.She___haveleftschool.Forherbikeisstillhere.(天津·6)A.can’tB.wouldn’tC.shouldn’tD.needn’tA,can’thavedonesth表示:“不可能做了某事”,对过去的否定推测,把握较大。“情态动词+havedone”
8、结构用法小结2.–Ican’tfindmypurseanywhere.–You___havelostitwhileshoping.(重庆·30)A.mayB.canC.shouldD.wouldA,mayhavedonesth表示:“可能做了某事”,对过去情况的推测,把握较小。“情态动词+havedone”结构用法小结3.Whatapity!Consideringhisabilitya