高中英语 Unit 2 Healthy eating Model Verbs情态动词的基本用法导学案新人教版必修3.doc

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1、Unit2HealthyeatingPeriod4--ModelVerbs情态动词的基本用法 Teachingaimsanddemands:Enablethestudentstounderstandandusethemodalverbs.Step1TurntoP13(textbook)anddotheEx2first.Checkyouranswerswithyourclassmates.Step2请用must,may,should,could,oughtto,need,wouldrather填空(1)HewouldnotdieifI______havehelpedh

2、im..(2)Mary____havegoneswimmingwithRose,butIamnotsureaboutit.(3)Youlooktired.You_____havestayeduplatelastnight.(4)—You_____havewrittenwithapen,notapencil.—Yes,IknowI_____have,butIhadnopentowritewith.(5)I__________havecometoyourparty,butIwasbusypreparingmyspeech.(6)Yourhomeisnotfarawayf

3、romschool,soyou_____nothaveleftinsuchahurry.Step3Conclusion小结：1.“情态动词+havedone”表示猜测和估计(1)musthavedone表示对过去的肯定猜测。e.g.Itmusthaverainedlastnightbecausethegroundwaswet.(2)may/mighthavedone也是对过去猜测，语气没有must强烈。e.g.Thestudentsmayhavedonetheirexercisesyesterday.Theymighthavereadaboutitinthepape

4、rs.(3)can/couldhavedone表示过去本来能够做某事但实际未做；e.g.Shecouldhavedonebetter.她本来可以做的更好的。can’t/couldn’thavedone表示不可能做过某事，即对过去的否定推测e.g.Hecan’thavefinishedtheworksosoon.2.“情态动词+havedone”形式表示虚拟，表示说话人后悔、遗憾、责备的语气。(1)should/oughttohavedone表示过去本该做某事而没有e.g.Youshouldhavestudiedharder.1.Weshouldhavearrived

5、(本应该到达)atlunchtimebutourflightwaslate.(2)shouldn’t/oughtn’ttohavedone表示过去不该做某事却做e.g.Youshouldn’thavedonethat.2.Markneedn’thavehurried(本不需要着急).Afterrunningalltheway,hearrivedtenminutesearly.(3)needn’thavedone表示本不必要做的事情却做e.g.Youneedn’thavebroughtsomuchwine.(4)wouldratherhavedone表示过去本想做某事

6、却未能做e.g.Iwouldratherhavecometoyourparty,butIwasbusypreparingmyspeech.3.oughtto,must和haveto的区别must强调主观看法haveto强调客观需要oughtto表示义务责任4.must与oughtto表示推测时的区别must语气肯定oughtto语气不肯定5.should+动词原形，表示(1)应该eg.你应该今天完成任务Youshouldfinishittoday.(2)惊讶、奇怪、居然eg.他居然这么难过，真是奇怪It’sstrangethatheshouldbesoupset.S

7、tep4Homework