【情态动词的用法】
<p>问题：【情态动词的用法】<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">杜高明的回答：<div class="content-b">网友采纳 Grammar—Modal-verb Ⅰ.情态动词 一、can/could 1.表示能力时 was/wereableto具体做成某件事（=managedtodo） could只表示能够 2.can+感官动词 cantaste/see/hear/smell/feel/believe/decide/understand 3.can表示惊讶、不敢相信 Eg:Howcanyoudolikethis? 4.cannotbutdo cannotchoosebutdo cannothelpbutdo Eg:Icannotbutfeelsorryforher. Icannotchoosebutfollowheradvice. 5.cannot…over/enough/too…都不过分；越…越好 Eg:Youcannotoverpraisehim. 6.理论上的可能性： Eg:Accidentscanhappenonsuchrainydays. Anyonecanmakemistakes. Thetemperaturecanfallto-40℃. 7.can’t表示否定推测： Eg:Itcan’tbehim,forhehasgonetoParisyesterday.不能用mustn’t 8.can/could表示允许、请求 Can/MayIhelpyou? IwonderifIcan/coulddosth.(此处could不表示时态) -Can/Could/MayIuse…? -Yes,youcan/may. -No,youcan’t/maynot/mustn’t.(题目选项中如果表否定允许有mustn’t就选mustn’t) You’dbetternot.(may问一般不用may回答) I’dratheryoudidn’t. 9.can/could(not)havedone (1)本能做、没能够 (2)过去可能会做、过去不可能做 Eg:HecouldhavekilledHarryPotter,buthedidn’t.（过去本能够） Hecouldn’thavekilledhim17yearsago,andhecannotdoitnow,either.（过去没能够） Canhehavegonetohisaunt’s?(过去可能会做) Hecannothaveforgottenit.（过去不可能） 二、may/might 1.may/might推测性用法可能 Hemayberight. Hemaynotcometoday(可能不) Hemay/mightcometomorrow. 注意：只用于肯定和否定句中,不用于疑问句中 2.maynot可能不cannot不可能 HemaynotcomeHecan’tcome 3.mayaswell最好maywell理应,有足够的理由 Youmay（might）aswellstaywhereyouare. -Shallwewalk? -Wemayaswell. 4.表祝愿Mayyoubehappy! 5.may(might)+have+done表示对过去发生行为的推测,也许或许已经做 Itmayhavebeentrue. Hemightnothavesettledthequestion. Hemaynothavefinishedthework. Ithinkhemayhavegonetobed. 6.may表示目的 Eg:Youmustgotobedearlysothatyoucan/maycatchthetrain. 7.表示让步 Eg:Howeverhardhemaytry,hecannotgetthefirstplace. 三、must 1.表示义务意为“必须”（主观意志） Eg:Wemustdoeverythingstepbystep. Youmustn’ttalktoherlikethat. -Mustwehandinourexercise—booksnow? -No,youneedn’t./No,youdon’thaveto. 2.肯定推测（绝对不能用于否定推测!否定推测用can’t/couldn’t） Eg:Hemustbeill.Helookssopale. She’swearingadiamondnecklace.Shemusthavealotofmoney. 3.偏要做,偏偏 Eg:WhymustrainonFriday? Mustyouspeaksoloudly? Ifyoumustsmoke,pleasegoout! 4.musthavedone想必准时一定做了某事,否定是can’t/couldn’thavedone 5.didn’tneedtohavedone过去没有必要做,具体是否做不强调 needn’thavedone本不必却做了 四、shall 1.在肯定句、否定句中表示命令、警告、威胁、许诺以及法律、规定、规章制度 Eg:Youshallleavetheroomatonce,andheshall,too. Ithasbeenannouncedthatcandidatesshallremainintheirseatuntilallthepapershavebeencollected. -whencanIgetmycomputerback? -Well,youshallhaveitonSaturday.
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