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人教课标人教课标高一高一必修必修3Unit2Findthesentencescontainingmodalverbsinthereadingpassage.Thenusuallybylunchtimetheywouldallbesold.Whatcouldhavehappened?NothingcouldbebetterSomethingterriblemusthavehappenedifHecouldnotbelievehiseyes.Perhapsheshouldgotothelibraryandfindout.Hehadbetterdosomeresearch!EventhoughhercustomersmightgetthinaftereatingYongHuisfoodTheywouldbecometiredveryquickly.a.should,oughtto都可表示都可表示“应该应该”。oughtto用于用于表示按道理应当表示按道理应当，常指，常指客客观的义务或责任观的义务或责任，大多数情况下可用大多数情况下可用should代替，但比代替，但比should语气重语气重。Ishouldhelpherbecausesheisintrouble.Yououghttotakecareofthebaby.b.表示劝告、建议或命令时，表示劝告、建议或命令时，should和和oughtto可通用可通用，但在，但在疑问句中常用疑问句中常用should。oughtto的否定式为的否定式为oughtntto或或oughtnotto。Youshould/oughttogotoclassrightaway.ShouldIopenthewindow?Whatshouldwedonext?c.should,oughtto都可表示推测。都可表示推测。Heoughtto/shouldbehomebynow.Thisiswheretheoiloughtto/shouldbe.should和和oughtto后面跟动词不定式的完后面跟动词不定式的完成式成式,其肯定句表示其肯定句表示“过去应该做而未做过去应该做而未做”,其否定句则表示其否定句则表示“过去不该做但做了过去不该做但做了”。Youshould/oughttohavemadethedecisionaweekago.Ishouldnthavemadesuchafoolishmistake.多数情况下，多数情况下，oughtto可与可与should互互换使用。换使用。oughtto的反意疑问句用的反意疑问句用shouldnt替代。替代。YououghttohavehelpedhimwithhisEnglish,_?A.wontyouB.oughtnotyouC.shouldntyouD.wouldntyou2.must和和havetomust的用法的用法1)表示主观的义务和必要表示主观的义务和必要,主要用于主要用于肯定句和疑问句肯定句和疑问句,意思为意思为“必须必须，得，得，要，要”；由；由must引起的疑问句，肯定回答要用引起的疑问句，肯定回答要用must或或haveto,否定回答要用否定回答要用neednt或或donthaveto,意思是意思是“不必不必”；must的否定形式的否定形式mustnt表示禁止，表示禁止，意思是意思是“不能，不许不能，不许”。如：。如：MustIfinishthetaskrightnow?我现在必须完成这个工作吗？我现在必须完成这个工作吗？Yes,youmust./Yes,youhaveto.是的。是的。(No,youneednt./No,youdonthaveto.不，不必。不，不必。)Youmustntcomeherewithoutpermission.未经允许，你不能来这儿。未经允许，你不能来这儿。haveto的用法的用法1)must表示一种主观的需要，而表示一种主观的需要，而haveto表示一种客观的需要，意思是表示一种客观的需要，意思是“不得不不得不”。如：如：Ihavetoattendanimportantmeetingthisafternoon.今天下午我不得不参加今天下午我不得不参加一个重要的会议。一个重要的会议。Motherisout,soIhavetolookaftertheshop.妈妈不在家，因此我不得不照看商店。妈妈不在家，因此我不得不照看商店。2)haveto的否定形式是的否定形式是donthaveto,相相当于当于neednt。如：。如：Theydonthavetobuyacomputeratpresent.他们目前没有必要买电脑。他们目前没有必要买电脑。Thebosshasgiveneveryoneaspecialholiday,sowe_gotoworktomorrow.A.cantB.mustntC.needntD.shouldnt【点拨点拨】考查情态动词。根据题意考查情态动词。根据题意,可可知这里表示知这里表示“没有必要没有必要”,故只能选故只能选C项。项。Whatdoyouthinkwecandoforouragedparents?You_doanythingexcepttobewiththemandbeyourself.A.donthavetoB.oughtnttoC.mustntD.cant【点拨点拨】根据题意根据题意“除了和他们呆在一除了和他们呆在一起做你自己外起做你自己外,没有必要做任何事情。没有必要做任何事情。”可知这里选择可知这里选择donthaveto表示表示“不不必必”。故选故选A项。项。3.must和和needa.need作情态动词时作情态动词时,只能用于疑问句只能用于疑问句和否定句。构成否定句和疑问句时不和否定句。构成否定句和疑问句时不借助于助动词借助于助动词do。NeedIfinishtheworktoday?Yes,youmust./No,youneednt.b.must的肯定形式表示的肯定形式表示“必须必须”，否，否定定式表示式表示“禁止、严禁禁止、严禁”。Youmustcomehere.Youmustnttakethebookawayfromthelibrary.Choosesuitablemodalverbsbelowtocompletethefollowingdialogues.ought/oughtnttoshould/shouldntwillmustntneednt(dont)havetocan/cant1.Sam:HowcanIgrowthinner,Mum?Mum:Well,you_eatfoodwithplentyoffibrethathelpsyoudigestbetter.Andyou_stopdrinkingcolaoreatingsweetfood.havetoshouldSam:DoesitmeanI_eatmyfavouritefriedchickenanymore?Mum:Notexactly,ifyoulovefriedchicken,you_giveitup.Justeatitlessoften.You_worrytoomuch:alittlefriedchicken_doyougood!shouldntneedntdonthaveto/neednt/shouldntwill2.Doctor:Youaresickbecauseyouveeatenpoisonousmushrooms.Wheredidyougetthem?Lucy:Ipickedthemintheforest.Iknowwe_eatfreshvegetables.Doctor:Oh,butyou_eatthemuntilyouresuretheyarenotpoisonous.Lucy:Thankyou,doctor.Illbemorecarefulnexttime.havetomustnt3.Charles:IwishIcouldseethingsclearlyinthedark.Tom:Eatingcarrots_helpyouseebetter.You_eatsomeeveryday.oughttoshould从从A、B、C、D四个选项中，选出可以四个选项中，选出可以填入空白处的最佳选项。填入空白处的最佳选项。1.IdontreallylikeJames.Whydidyouinvitehim?Dontworry.He_come.Hesaidhewasntcertainwhathisplanswere.(北京北京2011)A.mustnotB.neednotC.wouldnotD.mightnot2.I_worryaboutmyweekendIalwayshavemyplansreadybeforeitcomes.(上海上海2011)A.cantB.mustntC.darentD.neednt3.Howsyournewbabysitter?We_askforabetterone.Allourkidslovehersomuch.(浙江浙江2011)A.shouldB.mightC.mustntD.couldnt4.You_buyagift,butyoucanifyouwantto.(湖南湖南2010)A.mustB.mustntC.havetoD.donthaveto5.MayItakethisbookoutofthereadingroom?No,you_.Youreaditinhere.(陕西陕西2010)A.mightntB.wontC.neednt D.mustnt6.I_havewatchedthatmovieitllgivemehorribledreams.(山东山东2010)A.shouldntB.needntC.couldntD.mustnt7.Mark_havehurried.Afterdrivingattopspeed,hearrivedhalfanhourearly.(天津天津2010)A.needntB.wouldntC.mustnt D.couldnt8.WhenIwasyoung,IwastoldthatI_playwithmatches.(上海上海2008春春)A.wouldntB.needntC.mustntD.darent9.Whatsortofhousedoyouwanttohave?Somethingbig?Well,it_bebigthatsnotimportant.(陕西陕西2008)A.mustntB.needntB.C.cant D.wont10.Whatdoyouthinkwecandoforouragedparents?You_doanythingexcepttobewiththemandbeyourself.(重庆重庆2007)A.donthavetoB.oughtnttoC.mustntD.cant11.Thebosshasgiveneveryoneaspecialholiday,sowe_gotoworktomorrow.(上海上海2007春春)A.cantB.mustntC.needntD.shouldnt12.Someaspectsofapilotsjob_beboring,andpilotsoften_workatinconvenienthours.(湖南湖南2006)A.can;haveto B.may;canC.haveto;mayD.oughtto;mustmust;oughtntto;donthaveto;couldnt;mustnt;neednt;cant;haveto用所给的情态动词填空。用所给的情态动词填空。1.You_goonworkingbecauseyoulooksotirednow.2.Theweatherturnedouttobefineyesterday.I_havehadthetroubletocarrymyumbrellawithme.oughtntto/donthavetoneedntmust;oughtntto;donthaveto;couldnt;mustnt;neednt;cant;haveto3.Ifyouearnmorethan5,000,you_paytax.4.You_playnow!Youshallfinishyourhomeworkfirst!5.Iknowthingsarehardwithyou,butyou_trytogetoverthedifficulties.havetomustntmust/havetomust;oughtntto;donthaveto;couldnt;mustnt;neednt;cant;haveto6.Ididntseeheratthemeetingthismorning;she_havespokenatthemeeting.couldnt/cantHomeworkFinishUsingStructuresonPage50ofWorkbook.
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