情态动词(讲解版).doc

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1、ModalVerbs情态动词定义：表示说话人的情绪、态度或语气的动词叫情态动词。情态动词语法特征1）情态动词不能单独作谓语，没有人称，数的变化，即情态动词第三人称单数不加-s。2）情态动词的否定式是在情态动词后面直接+not。3）情态动词的疑问式是把情态动词提到主语前。主要情态动词8can,could（beableto）may,mightmust（haveto）will,wouldshall,shouldoughttoneeddare8情态动词的用法I.can/could1.___Can___y

2、ouspeakJapanese?Justalittle.2.Onlythejudge___can___saveherfromprison.3.I___could___driveacarbeforeIleftmiddleschool.4.ItwassodarkthatI___could___seenothing.Note:表能力、有权力（could是can的过去式）5.--___Can/Could___Igohomenow?--Yes,youcan.–No,youcan’t.6.--___Can/

3、Could___IspeaktoAndrew?7.You___can’t___（not）smokehere.Note:（口语）允许、请求，表可以(could非can的过去式，表委婉)8.It___can___/could____beverycoldhere,eveninspring.9.Sheisclever,butshe___can___/could___bedullsometimes.Note:（表示偶然现象发生的可能性）有时会，时而可能10.It___can’t___/couldn’t__

4、_(not)bemyfather.Heisabroadnow.81.Thereissomeoneoutside.Who___can___itbe?2.You__can’t/couldn’thaveseenhim__(notsee)him.Hewasnotthere.3.She__can’t/couldn’thavebeen___(notbe)morethansixthen.4.He__can’t/couldn’thavefinished___(notfinish)theworklastnight

5、withoutyourhelp.Note:表推测（否定、疑问句）5.He__couldhavetold__(tell)metheanswerbutherefusedto.Note:过去本能做而没有做6.You_cannot/cannever_________dotheworktoowell.7.You_cannot/cannever__becarefulenoughinyourstudy.Note:cannot…too;cannever...too;cannotenough再…都不为过；越…越好

6、can&beableto区别：1.can只有两种时态现在时can&过去时couldbeableto有各种时态2.用于一般所具有的能力，可以互换，但是当表示成功做到时，通常用beableto或manageto1.He_can/isableto_writemusic.2.Weshall__beableto__finishtheworksoon.3.Ihaven’t_beenableto_findthebook.4.He_could/wasableto__swimlikeafishwhenhewasy

7、oung.5.ItalkedwithherforalongtimeandfinallyI__wasableto_makeherbelieveme.6.Thefirespreadthroughthebuildingquicklybuteverybody___wasableto/managed___toescape.I.may/might1.--__May___Ileavenow?--Yes,you__may__./Yes，please.--No,you__maynot/can’t/mustn’t_

8、__.2.Heaskedifhe_might_____usethephone.3.Westartearlysothatwe_may/might___arriveintime.Note:（允许、请求）可以84.__May__youbehappyallyourlife.Note:祝、愿5.Johnisabsent.He__may/might_____beill.6.It_may/might______raintomorroworit__may/might_____bemerelycloudy.7.I