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学而思教育·学习改变命运思考成就未来！高考网:Howtousemodalverbscorrectly.TeachingDifficultPoint:Howtochoosemodalverbscorrectly.TeachingMethods:1.Reviewmethodtomastertheimportantusagesofmodalverbs.2.Inductivemethodandcomparativemethodtomastertheimportantanddifficultpoints.TeachingAids:1.themultimedia2.theblackboardTeachingProcedures:StepⅠGreetingsGreetthewholeclassasusual.StepⅡRevisionT:Inthisunit,wehavedonesomepracticeaboutmodalverbs.Asweknow,modalverbshaveseveralpointsincommonwhichmakethemquitedifferentfromotherverbs.Now,pleasediscussthepointsincommonamongmodalverbsingroupsoffour.AfterawhileIwillcheckyouranswers.(Teachergivesstudentsenoughtimetodiscuss,andthencollectstheiranswersandsumsthemup.)ModalVerbs:1.Modalverbsareusedwhenwesaythatweexpectthingstohappenorthatthingsarepossible,ornecessary,orimpossible,orimprobable,orwhenwedescribethingsthatdidn’thappen,orthatwearenotsurewhethertheyhappened.2.Modalverbshaveno-sonthethirdpersonsingular.Questionsandnegativesaremadewithout“do”.3.Modalverbshavenoinfinitives.4.Modalverbshavenopastforms.“Could”and“would”areusedwithpastmeaningsinsomecases.5.Modalverbscanbeusedwithperfectinfinitivetotalkaboutthingswhichdidn’thappen,orwhichwe’renotsureabout.StepⅢRevisionoftheImportantUsagesofModalVerbsT:Goodwork.Asweallknow,modalverbscanbeclassifiedintoeightgroupsaccordingtotheirusages.Todaywewillreviewsomeimportantusagesofmodalverbs.Firstly,let’sreviewthemodalverbsthatcanbeusedtoexpress“possibility”.Pleasetellmewhichmodalverbscanbeusedtoexpress“possibility”.Ss:Can/could/may/mightallexpress“possibility”.T:Whentheyexpress“possibility”,theyarenotquitethesame.“Can”isusedtotalkabouttheoreticalpossibility.Ifwewanttotalkabouttheactualchancesofsomethinghappening,or学而思教育·学习改变命运思考成就未来！高考网“could/may/might”.Besides,“can”issometimesusedtotalkaboutpresent“possibility”,butonlyinquestionsandnegativesentences.Isthatclear?Ss:Yes.T:Now,let’sdosomeexercisestomasterthembetter.Lookatthescreenandtrytofinishthesentencesassoonaspossible.(Teacherusesmultimediatoshowthesentencesonthescreen.)Fillintheblanksusingcan/could/may/might.1.Wouldyouliketoanswerthephone?It______beyoursister.2.Thepartofthecountry______beverywarminSeptember.3.______itbeLily?4.It______(not)betrue.5.You______beright.Suggestedanswers:1.could/may/might2.can3.Can4.can’t5.may/might/couldT:Besides“possibility”,can/could/may/mightarealsousedtoexpress“permission”.Yes?Ss:Yes.Butwearenotsureabouthowtousethem.T:Itdoesn’tmatter.Iwillgiveyousomeexplanation.“Can”isthecommonestoneofthefour,and“could”israthermorehesitantthan“can”.“May”and“might”areusedinamoreformalstyle.Theyoftensuggestrespect.“Might”ismorehesitantandisnotverycommon.Besides,whenwegivepermission,weusuallyuse“can”and“may”,butnot“could”and“might”.Whenwereportpermission,“may”isnotusuallyused.Areyouclearaboutit?Ss:Yes.T:Thentrytofinishthefollowingexercises,please.(Teachershowstheexercisesonthescreen.)1.—______Iuseyourphone?—Yes,ofcourse.You______.2.______youcomeintothemeetingroomwithoutshowingapassport?3.MarysaidthatI______borrowhercar.Suggestedanswers:1.Can/Could/May/Might;can/may2.Can3.might/could（“Might”and“could”canbeusedafterapastverb.)T:Next,whichmodalverbsdoyouthinkarenecessarytoreview?Ss:Themodalverbsexpressing“necessity”.Theyareveryimportant.T:Yes,Iagreewithyou.Wecanuse“must/haveto/havegotto/need”toexpress“necessity”.Butabouthowtousethem,Iwantyoutoreviewthembyunderstandingthefollowingsentencesbyyourselves.Lookatthesentencesonthescreen.(Teachershowsthesentencesonthescreen,andthenaskssomequestions.)1.Ireallymuststudyhard.2.Youmustbehereby3o’clock.3.Youhave(got)togoandseethemanager.4.Youneedn’tworkonSundays.T:Fromthesentences,whocantellmethedifferencebetween“must”and“haveto”?S1:Iwanttohaveatry.When“must”isused,thenecessitycomesfromthespeaker.Ifthe学而思教育·学习改变命运思考成就未来！高考网“outside”,“have(got)to”ismorecommon.T:Congratulations!Doyouknowhowtouse“need”?S2:Ithinkinnegativesentences,“don’tneedto”,“needn’t”or“don’thaveto”isusedtosaythatthereis“nonecessity”.T:Pleasegivemeanexample.OK?S2:Iknowthereasonwhyyouwerelate.Youneedn’ttrytoexplain.T:Thankyou.Inaddition,Iwanttotellyou“havegotto”isusedinsteadof“haveto”ininformalEnglish.Isthatclear?Ss:Yeah.T:Nowlookattheblackboard.(Writethefollowingontheblackboard.)1.Itmusthaverainedlastnight,forthegroundiswet.2.Youcan’thaveseenhimyesterday,forheisstillinAustralia.3.Youcouldhavetoldmehewascoming.4.Sheisverylate.Shemayhavemissedthebus.T:Thesesentenceshavesomethingincommon.Whocantellmewhatitis?Ss:Themodalverbsinthesesentencesareusedtogetherwithperfectinfinitives.T:Verygood.Thenlet’sreviewthemodalverbsusedtogetherwithperfectinfinitives.S3:Whenshouldweusemodalverbstogetherwithperfectinfinitives?T:Whenwetalkaboutthepast,wecanusethestructure,butithasaspecialmeaning.Itisusedforspeculating(thinkingaboutwhatpossiblyhappened)orguessing(thinkingabouthowthingscouldhavebeen