情态动词用法小结(复习).ppt

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1、情态动词用法小结高三复习一、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)Youcannotsmokeinthemeetingroom.(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”

2、Anybodycanmakemistakes.(只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.YesterdayIwasab

3、letogethomebeforetheheavyrain.may和might1．表示“许可”Youmaytakeawalk.Studentsmaynotmakenoiseinthelibrary.(maynot表示不许可或禁止)MayIcomein?否定回答No,youmustn‘t./cannot.也可用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)E

4、lectricironscouldbedangerous,theymightgiveyouasevereshock.3.“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'tthe

5、rebeanotherreasonforhisbehavior?3.偏偏Ourboymustdotheoppositetowhatweordered.JustwhenIwasbusy,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.YoushallhavethebookwhenIfinish

6、readingit.Heshallgethisallowance.Should1.表示“必须”：Ishouldanswerhisletterassoonaspossible.Youshouldn'tjudgeamanalwaysbytheclothes.(shouldn't劝告)2.猜测，“估计应该”ThatshouldbeJanetcomingupstairsnow.正在上楼的该是珍妮特。Will和Would1.表示“意愿”Iwillcallyouassoonaspossible.Whowilldothejob?Hewouldnot

7、letmetry.2..表示“请求”Willyoukindlytellmethewaytothepostoffice?Wouldyougivemeyouraddress?(用would比will表示更客气)3.表示“预测”或“习惯性”：Thatwouldbehismother.(wouldbe表示肯定是)Hewillsittherehourafterhourlookingattheriver.HewouldcometoseemewhenhewasinLondon.usedto与would的区别usedto表示过去情况与现在不同;wou

8、ld只单纯表示过去的情况Peopleusedtothinkthattheearthwasflat.Shewouldgooutforawalkinthemorningwhenshewasinthecountry.ought