GRAMMARFindthesentencescontainingmodalverbsinthereadingpassage.Thenusuallybylunchtimetheywouldallbesold.Whatcouldhavehappened?Nothingcouldbebetter”SomethingterriblemusthavehappenedifHecouldnotbelievehiseyes.Perhapsheshouldgotothelibraryandfindout.Hehadbetterdosomeresearch!EventhoughhercustomersmightgetthinaftereatingYongHuisfoodTheywouldbecometiredveryquickly.MODALVERBSa.should,oughtto都可表示都可表示“应该”。oughtto用于用于表示按道理表示按道理应当当，常指，常指客客观的的义务或或责任任，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语气重气重。Ishouldhelpherbecausesheisintrouble.Yououghttotakecareofthebaby.b.表示表示劝告、建告、建议或命令或命令时，should和和oughtto可通用可通用，但在，但在疑疑问句中常用句中常用should。oughtto的否定式的否定式为oughtntto或或oughtnotto。Youshould/oughttogotoclassrightaway.ShouldIopenthewindow?Whatshouldwedonext?c.should,oughtto都可表示推都可表示推测。Heoughtto/shouldbehomebynow.Thisiswheretheoiloughtto/shouldbe.should和和oughtto后面跟动词不定式的完成后面跟动词不定式的完成式式,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”,其其否定句则表示否定句则表示“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互换使用。互换使用。oughtto的反意疑问句用的反意疑问句用shouldnt替代。替代。注意注意YououghttohavehelpedhimwithhisEnglish,_?A.wontyouB.oughtnotyouC.shouldntyouD.wouldntyou2.must和和havetomust的用法的用法1)表示主表示主观的的义务和必要和必要,主要用于肯主要用于肯定句和疑定句和疑问句句,意思意思为“必必须，得，得，要，要”；由；由must引起的疑引起的疑问句，句，肯定回答要用肯定回答要用must或或haveto,否定回答要否定回答要用用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，意表示禁止，意思是思是“不能，不不能，不许”。如：。如： MustIfinishthetaskrightnow?我我现在必在必须完成完成这个工作个工作吗？Yes,youmust./Yes,youhaveto.是的。是的。(No,youneednt./No,youdonthaveto.不，不必。不，不必。)Youmustntcomeherewithoutpermission.未未经允允许，你不能来，你不能来这儿。儿。HAVETO的用的用法法1)must表示一种主表示一种主观的需要，而的需要，而haveto表示一种客表示一种客观的需要，意思的需要，意思是是“不得不不得不”。如：如：Ihavetoattendanimportantmeetingthisafternoon.今天下午我不得不参加一个重要的今天下午我不得不参加一个重要的会会议。Motherisout,soIhavetolookaftertheshop.妈妈不在家，因此我不得不照看不在家，因此我不得不照看商店。商店。2)haveto的否定形式是的否定形式是donthaveto,相当于相当于neednt。如：。如：Theydonthavetobuyacomputeratpresent.他他们目前没有必要目前没有必要买电脑。【考例考例】Thebosshasgiveneveryoneaspecialholiday,sowe_gotoworktomorrow.(上海上海2007春春)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,可知可知这里表示这里表示“没有必要没有必要”,故只能选故只能选C项。项。【考例考例】Whatdoyouthinkwecandoforouragedparents?You_doanythingexcepttobewiththemandbeyourself.(重庆重庆2007)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“不必不必”。故选故选A项。项。3.must和和needa.need作情作情态动词时,只能用于疑只能用于疑问句和句和否定句。构成否定句和疑否定句。构成否定句和疑问句句时不借不借助于助助于助动词do。NeedIfinishtheworktoday?Yes,youmust./No,youneednt.b.must的肯定形式表示的肯定形式表示“必必须”，否定，否定式式表示表示“禁止、禁止、严禁禁”。Youmustcomehere.Youmustnttakethebookawayfromthelibrary.用下列图片造句。用下列图片造句。做适当的运动做适当的运动 Youshoulddosomesports.慢慢地进食，并有助消化。慢慢地进食，并有助消化。Yououghttoeatslowlyanditsgoodfordigestion.Youshouldhelptosetthedinnertable.Youshouldkeepyourroomclean.Wemustlistentotheteachercarefully.Wemustnteatinclass.Yououghttohandonthehomeworkontime.Youshouldntbelateforschool.Weshouldaskquestionactively.Weshouldntmakenoiseinclass.MAKESENTENCES1.你每天最少要你每天最少要练习一小一小时口口语。YoumustpractisespeakingEnglishatleastanhouraday2.我每天不得不我每天不得不练习一小一小时口口语！IhavetopractisespeakingEnglishanhouraday！3.你你应该每天每天练习不止一小不止一小时。YououghttoshouldpracticeEnglishformorethananhour4.你你应该读一下一下这个。它写得很好。个。它写得很好。YououghttoshouldreadthisItsverygood5.你必你必须读这个。写得精彩极了！个。写得精彩极了！YoumustreadthisItsmarvelous！Pleasechooseaproperphraseandaccordingtothesituationscompletethesentencesbyusingshould (not) or ought (not) to.1.Lisaneedsachange.She_.2.Mysalaryisverylow.You_.should/oughttotakeafewdaysoffshouldlookforanewjob3.Nickalwayshasdifficultygettingup.He_.4.Whatabeautifulview!You_.5.Billysroomisntveryinteresting.He_.oughtnotto/shouldntgotobedsolateshouldtakeaphotoshouldnt/oughtnottousehercarsomuchChoosesuitablemodalverbsbelowtocompletethefollowingdialogues.ought/oughtnttoshould/shouldntmustntneednt(dont)havetowillcan/cant1Sam:HowcanIgrowthinner,Mum?Mum:Well,you_eatfoodwithplentyoffibrethathelpsyoudigestbetter.Andyou_stopdrinkingcolaoreatingsweetfood.havetoshouldSam:DoesitmeanI_eatmyfavouritefriedchickenanymore?Mum:Notexactly,ifyoulovefriedchicken,you_giveitup.Justeatitlessoften.You_worrytoomuch:alittlefriedchicken_doyougood!shouldntneedntdonthaveto/neednt/shouldntwill2Doctor:Youaresickbecauseyouveeatenpoisonousmushrooms.Wheredidyougetthem?Lucy:Ipickedthemintheforest.Iknowwe_eatfreshvegetables.Doctor:Oh,butyou_eatthemuntilyouresuretheyarenotpoisonous.Lucy:Thankyou,doctor.Illbemorecarefulnexttime.havetomustnt3Charles:IwishIcouldseethingsclearlyinthedark.Tom:Eatingcarrots_helpyouseebetter.You_eatsomeeveryday.oughttoshould1._todiscusssomethingwithsomeonesothatyoucanmakeadecisiontogether2._tochangefoodthatyouhavejusteatenintosubstancesthatyourbodycanuse练习坊练习坊I.根据下列英文解释写出所缺的单词。根据下列英文解释写出所缺的单词。consultdigest3._alongpointedorangevegetablethatgrowsundertheground4._containingpoisonorproducingpoisoncarrotpoisonous1.Foralongtime,Ivebuiltmybusinesswithpeoplewhoare_(精力旺盛的精力旺盛的),creative,andhappyabouttheirwork.2.Thisrichfooddoesnt_(消化消化)easily.energeticdigest根据下列各句句意及所给单词的汉语根据下列各句句意及所给单词的汉语提示提示,写出各单词的正确形式。写出各单词的正确形式。3.Thedishofboiledbeefand_(胡萝卜胡萝卜)tastesgood.4.Anincreasingnumberofpeopleare_(请教请教)theiraccountantsaboutthetaxlaws.5.Thismedicineis_(有毒有毒)iftakeninlargequantities.carrotconsultingpoisonousmust;oughtntto;donthaveto;couldnt;mustnt;neednt;cant;havetoII.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/cant1.Ithoughtyou_likesomethingtoread,soIhavebroughtyousomebooks.A.mayB.mightC.wouldD.must2.Whereismypen?I_it.A.mightloseB.wouldhavelostC.shouldhavelostD.musthavelost高考链接高考链接3.Ididnthearthephone.I_asleep.A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen4.-IsJohncomingbytrain?-Heshould,buthe_not.Helikesdrivinghiscar.(2002高考题）高考题）A.mustB.canC.needD.may5.Ithasbeenannouncedthatcandidates(候选人候选人)_remainintheirseatsuntilallthepapershavebeencollected.(2002上海上海高考题）高考题）A.canB.willC.mayD.shall6.-Iheardtheywentskiinginthemountainslastwinter.-It_truebecausetherewaslittlesnowthere.(2002北京北京高考题高考题)A.maynotbeB.wontbeC.couldntbeD.mustntbe7.-Therewerealreadyfivepeopleinthecar,buttheymanagedtotakemeaswell.-It_acomfortablejourney.A.cantbeB.shouldntbeC.mustnthavebeenD.couldnthavebeen8.Itsnearlysevenoclock.Jack_behereatanymoment.A.mustB.needC.shouldD.couldHOMEWORK1.Previewthereading(2)andreadingtaskonPage52.Seehowthestoryended.2.FindsomeinformationabouthealthyeatingontheInternet.