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ModalVerbIIUnit2•balanceyourdiet•feelfrustrated/discouraged/upset•betiredofsth•loseweight•nothavesb.gettingawaywithdoingsth.•findsth.limited•earnone’sliving•consultadoctor•cutdownone’sexpenses•Nothingcouldbebetter!•Curiositydrovesb.inside.•drivesb.mad/crazy•valuesb.•valuable•valueless=worthless•invaluableadvice•valueone’sadvice/friendship•valuesb.asafriend•Theweaknessofthisdietisthatithastomuchfatandsugar;itsstrengthisthatithasplentyofenergy-givingfood.•Theshopkeeperistryingtowinhiscustomersbackwithadiscount.•Ifyoudon’tsaysorryforyourmistake,theywon’tletyougetawaywithit.•Hehasbeenindebtforalongtime.Howtoearnhislivingisabigproblem.•WhenIwaswaitingformyfriend,Isuddenlyspiedamannotfarawayglaringatme.•Idon’twanttolietoyou,butIhavetosaythathisintelligenceislimited.•Expertssayeatingcarrotsbenefitsyoureyes.•Iusuallyeatdumplingswithalittlevinegar,whichIbelievehelpsmedigestthefood.•Bylunchtimetheywouldallbesold.•Bynowhisrestaurantoughttobefullofpeople.•Whatcouldhavehappened?•Nothingcouldbebetter.•EventhoughthercustomersmightgetthinaftereatingYonghui’food…•Theywouldbecometiredveryquickly.•possibility•Somethingterriblemusthavehappenedif…•Guessing•I’llhelpyouloseweight…•Hecouldn’thaveYongHuigettingawaywithtellingpeoplelies.•Intention•Hecouldn’tbelievehiseyes.•Hecouldwinhiscustomersback.•Ability•Perhapsheshouldgotothelibraryandfindout.•Hehadbetterdosomeresearch.•DutyIthinkshe_______apologisetothepublic.You________goandseethedoctor.我认为她应该向公众道歉。你应当去找医生看看病。oughttooughttoFillintheblanksaccordingtotheChinese.Titanic______beagoodmovie.Weknowifwekeepatitwe_______succeed.泰坦尼克号应该是部好电影。我们知道如果我们坚持下去就应该会成功。shouldshouldWe______putonwarmclothesinwinter.冬天的时候，我们不得不穿上温暖的衣服。你必须把面粉和黄油和在一起。You_______mixtheflourandthebutter.havetohavetoInEnglandtraffic_____keeptotheleft.在英国，车辆必须靠左行驶。Allpassengers______wearseatbelts.所有乘客都必须系安全带。mustmust上面的空你都填对了吗？如此多的情态动词，我们应当如何使用呢？接下来就进行详细的讲解。should和oughtto都为“应该”的意思，可用于各种人称。oughtto的语气稍重一些。Yououghtto(should)followyourteacher’sadvice.oughtto／should表示主语的义务或责任：Youshouldtakecareofyoursister.你应当去照顾你妹妹。或指出一个正确、明智的动作：Theyshouldn'tallowparkinghere；thestreetistoonarrow．这儿不该允许停车；马路太窄了。should和oughtto后面跟动词不定式的完成式,其肯定句表示”过去应该做而未做”,其否定句则表示”过去不该做但做了”。Youshould/oughttohavemadethedecisionaweekago.Ishouldn'thavemadesuchafoolishmistake.注意must的用法1.表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须……，得……，要……”；由must引起的疑问句，肯定回答要用must或haveto,否定回答要用needn’t或don’thaveto,意思是“不必”；must的否定形式mustn’t表示must/haveto禁止，意思是“不能,不许”。如：—MustIfinishthetaskrightnow?我现在必须完成这个工作吗？—Yes,youmust./Yes,youhaveto.是的。(—No,youneedn’t./No,youdon’thaveto.不,不必。)haveto的用法1.must表示一种主观的需要，而haveto表示一种客观的需要，意思是“不得不”。如：Ihavetoattendanimportantmeetingthisafternoon.今天下午我不得不参加一个重要的会议。Motherisout,soIhavetolookaftertheshop.妈妈不在家，因此我不得不照看商店。2.haveto的否定形式是don’thaveto,相当于needn’t。如：Theydon’thavetobuyacomputeratpresent.他们目前没有必要买电脑。表示推测——情态动词的重要用法情态动词对将来对现在对过去肯定的推测可能的推测+V.常见mustbe+V./+bedoing+havedone+V.mustmay/might+V./+bedoing+have+done可以用not表示“可能不”情态动词对将来对现在对过去否定的推测疑问的推测can’t/couldn’tcan/could+V./+bedoing+V.+havedone+V.+V./+bedoing+havedone在不表示推测的情态动词中,我们要注意以下方面的问题:1.表示能力、许可的情态动词的用法。2.表示否定的情态动词的用法。3.shall和will的多种意义的区别。4.情态动词短语的使用。5.虚拟语气中情态动词的使用。表示能力:can,could,beabletobeableto能用于各种时态。can/could只能表示现在或过去的能力。was/wereableto设法做成某事相当于managedtodosth.succeededindoingsth.1.表示能力、许可的情态动词的用法。表示许可:may/might,can/couldmight,could比较委婉,一般多用于疑问句。can,may表达的语言比较随便。在以could,might表示征询对方意见或表示请求时，回答应相应使用can,may。2.表示否定的情态动词的用法:mustn’t不准;禁止needn’t没必要(=don’thaveto)can’t不能;不可能maynot不可以;可能不shouldn’t不应该(=oughtnotto)部分情态动词的否定式是情态动词中的考点之一。不同的“肯定”程度可按下列层次排列：Heisathome.(事实)Hemustbeathome.（非常肯定的推断）Hecouldbeathome.（很可能）Heoughttobeathome.（很可能）Hemaybeathome.（仅仅可能而已）Hemightbeathome.（或许,非常不确定）Hecouldn’tbeathome.（很可能不在家）Hecan’tbeathome.（一定不在家）Heisn'tathome.（事实）3.情态动词shall,will的多种意义:shall/will+动词原形:shall可表示必须、命令、警告或征询意见。will可表示意愿、常出现的动作、在疑问句中表示请求和建议。均可表示将来。过去时为should,would。4.情态动词短语的使用:wouldliketodo…wouldratherdo…wouldrather+从句wouldprefertodo...hadbetterdo...5.用于虚拟语气的情态动词:shouldmightcouldwouldneedn’toughtto1.Ithoughtyou_____likesomethingtoread,soIhavebroughtsomebooks.A.mayB.mightC.wouldD.must2.Whereismypen?I____it.A.mightloseB.wouldhavelostC.shouldhavelostD.musthavelost3.Ididn’thearthephone.I___asleep.A.mustbeB.musthavebeenC.shouldbeD.shouldhavebeen4.--IsJohncomingbytrain?--Heshould,buthe____not.Helikesdrivinghiscar.A.mustB.canC.needD.may5.Ithasbeenannouncedthatcandidates(候选人)____remainintheirseatsuntilallthepapershavebeencollected.A.canB.willC.mayD.shall6.--Iheardtheywentskiinginthemountainslastwinter.--It____truebecausetherewaslittlesnowthere.A.maynotbeB.won’tbeC.couldn’tbeD.mustn’tbe1.我不得不接受你的建议。2.未经允许，你不能来这儿。3.你应当去照顾你妹妹。4.他们想必已到那儿了。Youmustn’tcomeherewithoutpermission.Youshouldtakecareofyoursister.Theyoughttobetherebynow.Ihavetoacceptyoursuggestion.情态动词(+动词原形)行为动词.needdare1.无人称和数的变化;2.尤其用于：*否定句及疑问句中;*在if/whether之后;*或与hardly,never,noone,nobody连用;3.常以needn’t和daren’t的形式出现;4.dare有其过去时dared.多用于肯定句;(sb.)needtododaretodoneedtobedoneneeddoingneed/dare注意对need问句的回答:--NeedIfinishtheworktoday?--Yes,________________.No,________________.No,___________