高中英语-情态动词课件.ppt

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1、情态动词用法小结（复习）一、各个情态动词用法归纳can和could1.表示“能力”Icanswim,butmysistercan't.2．表示“许可”、“请求”CanIgowithyou?(请求)FathersaidIcouldgotocinema.(表示过去的许可)Youcannotsmokeintheroom.(cannot表示“禁止”)CouldIuseyourphone?Yes,ofcourseyoucan.肯定回答，不能用could，一般是—Yes,please.—Thanks.3．表示“理论上或逻辑上的可能”Anybodycanmakemistakes.(只

2、表示理论上的可能性)Anaccidentcanhappenifyoudothis.(表示事情肯定会发生)4．“猜测”（主要用于否定句和疑问句）：Hecan'tbeathome.(否定句)Canthenewsbetrue?(疑问句)与beableto的区别：can只有现在和过去时态，强调能力；beableto有各种时态，表示"一时"的能力，强调结果。Marycanplaythepiano.Shehasbeenabletoplayitsinceshewas5.YesterdayIwasabletogethomebeforetheheavyrain.1．表示“许可”Youma

3、ytakeawalk.Studentsmaynotmakenoiseinthelibrary.(maynot表示不许可或禁止)MayIcomein?否定回答No,youmustn't./cannot.也可以maynot肯定回答sure,certainly,ofcourseMightItroubleyouforalight?"Youmayindeed."2.表示"事实上的可能性"Itmayraintomorrow.(表示可能会发生)Electricironscouldbedangerous,theymightgiveyouasevereshock.may和might3.“

4、预测”Sammighthavetakenthemoney,butitseemsunlikely.must1.表示“必须”、“务必”：Wemustobeyorders.MustIpaynow?肯定回答Yes,youmust否定回答No,youneedn't或No,youdon'thaveto2.表示“预测”(必定，必会)一般用于肯定句。可用于否定一般疑问句。Theremustbeamistake.Mustn'ttherebeanotherreasonforhisbehavior?3.偏偏Ourboymustdotheoppositetowhatweordered.Just

5、whenIwasbusy,shemustcomeandchatshall1.用于第一、三人称，表示征求对方的意见Shallwetalk?Shallhecometoseeyou?2.用于第二、三人称，表示"命令、允诺、警告、决心"等Eachmembershallwearanamecard.Nooneshallstopme.YoushallhavethebookwhenIfinishreadingit.（允诺）Heshallgethisallowance.Should1.表示“必须”：Ishouldanswerhisletterassoonaspossible.Yousho

6、uldn'tjudgeamanalwaysbytheclothes.(shouldn't劝告)2.猜测，“估计应该”ThatshouldbeJanetcomingupstairsnow.Will和Would1.表示“意愿”Iwillcallyouassoonaspossible.Hewouldnotletmetry.3.表示“预测”或“习惯性”：Thatwouldbehismother.(wouldbe表示肯定是)Hewillsittherehourafterhourlookingattheriver.HewouldcometoseemewhenhewasinLondo

7、n2..表示“请求”Willyoukindlytellmethewaytothepostoffice?Wouldyougivemeyouraddress?(用would比will表示更客气)usedto与would的区别usedto表示过去情况与现在不同;would只单纯表示过去的情况Peopleusedtothinkthattheearthwasflat.Shewouldgooutforawalkinthemorningwhenshewasinthecountry1.表示“应该”Yououghttogotoseethedoctor.(o