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1、ModalVerbs情态动词有can(could),may(might),must(must),haveto,shall(should),will(would),need(need),dare(dared),oughtto等。情态动词无人称和数的变化。它不能单独使用，必须跟其后的动词原形构成谓语。情态动词的具体用法如下：一、can,could1、表示能力。a.CanyouspeakEnglish?b.Canyoufinishthisworktonight?c.Mancannotlivewithoutair.Note:33(1
2、)can表示能力时，可用beableto代替。a.I’llnotbeabletocomethisafternoon.(2)当我们要表示“某件事情已经成功”时，应用was/wereableto,不能用coulda.Hesawwellandhewasabletoswimtotheriverwhenthefloodhappened.b.Hewasabletogotothepartyyesterdayeveningandheenjoyedhimselfverymuch.2、表示客观可能性33a.Peoplewholivenearai
3、rportscanhavetheirhearingharmed.b.Theboycansometimesbeverynaughty.（表示某人或某物一时的情况，“有时会。。。”）c.Theinventioncanbeimproved.d.Evenexpertscanmakemistakes.e.Hecan’tbeinBeijingnowbecauseIsawhimamomentago.f.Hehadalotofworktodolastnight,sohecouldn’thavegonetoseeafilm.Note:33在肯
4、定句中用can表示可能性时，其含义是理论上的可能性，不表示实际的可能性，也就是说，不涉及到是否真会发生。3、表示惊异、怀疑、不相信的态度（主要用与否定句、疑问句或感叹句中）a.Canthisbetrue?b.Howcanyoubesocareless!c.Thiscannotbedonebyhim.4、表示请求和允许。a.---CanIgonow?---Yes,youcan.b.Youcansmokeifyouwantto.c.Youcan’tpickflowersinthispark.33Note:could也可以表示请求
5、，语气较委婉，主要用于疑问句，不用于肯定句，回答应用can---CouldIcometoseeyoutomorrow?---Yes,youcan./No,I’mafraidnot.5、can的一些其他惯用法(1).cannotbut,cannothelpbut,cannotchoosebut+动词原形，意思为“不得不，只得”。a.Icannothelpbuttellherthetruth.2.cannothelpdoingsth33a.Icannothelplaughing.3.cannot…too/enough,canne
6、vertooa.Youcannotbetoocarefulwhenyoucrossthestreet.b.Icannotthankyoutoomuchforyourkindness;Iowemyprogresstoyou.二、may,might1、表示许可。a.Youmaygonow.b.Wemaykeepthebooksfortwoweeks.c.---MayIsmokehere?---Yes,youmay./No,youmay33not./No,youmustn’t.2、表示可能性a.Hemaybewaitingfory
7、ouatthestation.b.Theymayhavegotlost.Note:表示可能性时，may不用于疑问句。在疑问句中表示“可能”时，通常用“belikelyto”或“Doyouthink”这一结构。3、用于让步状语从句中a.Howeverhardyoumaystudy,youcannotmasterEnglishinamonth.b.Don’tgiveupwhatever33difficultiesyoumaymeetwith.4、用于祈使句，表示祝愿。a.Mayyousucceed!b.Mayweneverfor
8、geteachother!5、might常用于表示委婉的请求或轻微的责备。a.Youmightpostthisletterformeifyouaregoingnearapostbox.b.Youmighthaveletmeknowbefore!６、用于某些习惯用法中(1)may/might
