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1、情态动词的用法要点情态动词是一种本身有一定的词义，表示说话人的情绪、态度或语气的动词，但不能单独作谓语，只能和其他动词原形构成谓语。Wecanbethereontimetomorrow.我们明天能按时去那儿。MayIhaveyourname?我能知道你的名字吗？Shallwebeginnow?我们现在就开始吗？Youmustobeytheschoolrules.你必须遵守校规。情态动词数量不多，但用途广泛，主要有下列：can(could),may(might),must,need,oughtto,dare(dared),shall(should),will
2、(would)一、情态动词用于推测情态动词含义适用句型时态表示mustmaymight一定也许或许肯定句现在:must+be/do现在正在：must+bedoing过去:must+havedonecancould可能或许否定句疑问句现在:can’t+be/do过去:can’t+havedone1.Imustbethehappiestwomanonearth!我一定是世界上最幸福的女人了。2.Hemusthavemistakenmymeaning.他一定误会了我的意思。3.Shemay(might)havereadabouttheeventinthenews
3、papers.她可能在报上已读到过此事。4.Heseemssounnatural.Hemustbelying.5.Itcan’t(couldn’t)betrue.那不可能是真的。1.Whatcan(could)theybedoing?他们会在干什么呢?2.Whydoesheknowthis?Can(Could)someonehavetoldhimaboutit?他怎么知道?会是哪个人告诉他了吗?Practice1.Youhaven’teatenanythingsincethismorning;you(be)hungry.2.That(be)Mary—she
4、’sinhospital.3.Mybookhasdisappeared.Who(take)it?4.Theteacher(know)theanswertothisquestion.5.Itiscoldintheroom.They(turnoff)theheating.6.He(listento)theradionow.Itistoonoisy.二、情态动词和虚拟语气虚拟语气是一种用来表示假设、愿望、建议、请求、命令、猜测、可能或空想等的一种语气。1、在非真实条件句中的用法：if从句的动词形式主句动词形式与现在相反的假设过去式（be用were）shouldw
5、ould+动词原形mightcould与过去相反的假设had+doneshouldwould+have+donemightcould1)IfIwereyou,Iwouldgothere.2)IfIknewhistelephonenumber,Ishould(would,could)ringhimup.3)Ifhehadworkedhard,hewouldhavesucceeded.l浓缩从句1)Itwouldbeamistakenottodefendourowninterest.(Itwouldbeamistakeifwedidnotdefendourow
6、ninterest.)2)Youwouldhavedonethesamethinginherposition.(Ifyouwereinherposition,youwouldhavedonethesamething.)3)Withoutyourhelp,wewouldneverhavesucceeded.(Ifyouhadnothelpedus,wewouldneverhavesucceeded.)4)Theywouldhavediedofthediseasebutforthenewmedicine.5)(Theywouldhavediedofthedis
7、easeiftheyhadnotgotthenewmedicine.)6)He_________hiscollegeeducation,buthehadtoquitandfindajobtosupporthisfamily.A.couldfinishedB.canhavefinishedC.musthavefinishedD.wouldhavefinished7)Wefinishedintwoyearstheprojectwhich_____threeyearstofinish.A.hadtakenB.musthavetakenC.wouldhavetak
8、enD.wouldtake8)Atthattime,theonly
