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1、ModalVerbs情態(tài)動(dòng)詞有can(could),may(might),must(must),haveto,shall(should),will(would),need(need),dare(dared),oughtto等。情態(tài)動(dòng)詞無人稱和數(shù)的變化。它不能單獨(dú)使用，必須跟其后的動(dòng)詞原形構(gòu)成謂語。情態(tài)動(dòng)詞的具體用法如下：一、can,could1、表示能力。a.CanyouspeakEnglish?b.Canyoufinishthisworktonight?c.Mancannotlivewithoutair.Note:
2、(1)can表示能力時(shí)，可用beableto代替。a.I’llnotbeabletocomethisafternoon.(2)當(dāng)我們要表示“某件事情已經(jīng)成功”時(shí)，應(yīng)用was/wereableto,不能用coulda.Hesawwellandhewasabletoswimtotheriverwhenthefloodhappened.b.Hewasabletogotothepartyyesterdayeveningandheenjoyedhimselfverymuch.2、表示客觀可能性a.Peoplewholivene
3、arairportscanhavetheirhearingharmed.b.Theboycansometimesbeverynaughty.（表示某人或某物一時(shí)的情況，“有時(shí)會(huì)。。?！保ヽ.Theinventioncanbeimproved.d.Evenexpertscanmakemistakes.e.Hecan’tbeinBeijingnowbecauseIsawhimamomentago.f.Hehadalotofworktodolastnight,sohecouldn’thavegonetoseeafilm.N
4、ote:在肯定句中用can表示可能性時(shí)，其含義是理論上的可能性，不表示實(shí)際的可能性，也就是說，不涉及到是否真會(huì)發(fā)生。3、表示驚異、懷疑、不相信的態(tài)度（主要用與否定句、疑問句或感嘆句中）a.Canthisbetrue?b.Howcanyoubesocareless!c.Thiscannotbedonebyhim.4、表示請求和允許。a.---CanIgonow?---Yes,youcan.b.Youcansmokeifyouwantto.c.Youcan’tpickflowersinthispark.Note:coul
5、d也可以表示請求，語氣較委婉，主要用于疑問句，不用于肯定句，回答應(yīng)用can---CouldIcometoseeyoutomorrow?---Yes,youcan./No,I’mafraidnot.5、can的一些其他慣用法(1).cannotbut,cannothelpbut,cannotchoosebut+動(dòng)詞原形，意思為“不得不，只得”。a.Icannothelpbuttellherthetruth.2.cannothelpdoingstha.Icannothelplaughing.3.cannot…too/en
6、ough,cannevertooa.Youcannotbetoocarefulwhenyoucrossthestreet.b.Icannotthankyoutoomuchforyourkindness;Iowemyprogresstoyou.二、may,might1、表示許可。a.Youmaygonow.b.Wemaykeepthebooksfortwoweeks.c.---MayIsmokehere?---Yes,youmay./No,youmaynot./No,youmustn’t.2、表示可能性a.Hemayb
7、ewaitingforyouatthestation.b.Theymayhavegotlost.Note:表示可能性時(shí)，may不用于疑問句。在疑問句中表示“可能”時(shí)，通常用“belikelyto”或“Doyouthink”這一結(jié)構(gòu)。3、用于讓步狀語從句中a.Howeverhardyoumaystudy,youcannotmasterEnglishinamonth.b.Don’tgiveupwhateverdifficultiesyoumaymeetwith.4、用于祈使句，表示祝愿。a.Mayyousucceed!b
8、.Mayweneverforgeteachother!5、might常用于表示委婉的請求或輕微的責(zé)備。a.Youmightpostthisletterformeifyouaregoingnearapostbox.b.Youmighthaveletmeknowbefore!６、用于某些習(xí)慣用法中(1)may/mightaswell=hadbett
