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1、Acan/could=beableto1表示能力兩種時(shí)態(tài)can(could)，其他時(shí)態(tài)要用beableto的形式HecanspeakFrench.Was/wereableto可以表示成功做成某事的含義*managedtodo/succeededindoingWithourhelp,hewasabletobuildthehouse.2表示請(qǐng)求或許可Could比Can更加客氣*mayCanIgonow?Yes,youcan.3表示推測(cè)或可能性，常用于否定句和疑問(wèn)句Canhebeatschool?Toda
2、yisSunday.Hecan'tbeatschool. Can’tcouldn’t/Can?Could?havedoneThereisnolightintheroom.Canshehavegonetobed?Shecan’thavegonetoschool-----it’sSunday.Couldhavedone可用在肯定句中表示過(guò)去存在的可能性*mayhavedoneShecouldhavegoneoutwithsomefriendsyesterday.Couldhavedone可以表示虛擬語(yǔ)氣
3、某事可能發(fā)生（并沒(méi)有發(fā)生）ItwassillytothrowtheTVoutofthewindow.Itcouldhavehitsomebody.批評(píng)某人沒(méi)有完成某事(本可以做某事)Youarelateagain.Youcouldhavegotupearlier.4can表示客觀上的可能性*Anybodycanmakemistakes.Bmayandmight的用法1表示請(qǐng)求和允許類似用法cancould(更加口語(yǔ)化)MayIwatchTVnow?Yes,youmay.2表示可能性;猜測(cè)might比
4、may更加不確定may/mighthavedone對(duì)過(guò)去的揣測(cè)*Hemaybebusythesedays.Maynot可能不；不可能；一定不可3表示祝愿Wishyousuccess!Mayyousucceed!*Cmustandhaveto1表示必須；一定要可以用haveto代替must現(xiàn)在；將來(lái)的必須而且是主觀看法*haveto有多種時(shí)態(tài)而且強(qiáng)調(diào)客觀情況Ireallymuststopsmokingnow.IhadtoleaveearlybecauseIwasn’tfeelingwell.MustI
5、comehere?Yes,youmust.No,youneedn’t.needn’t/don’thavetomustnot一定不能做某事mustn’t2must表示推測(cè)意思非?？隙ā耙欢ㄊ恰薄耙欢〞?huì)”Itmustberainingoutside.Musthavedone對(duì)過(guò)去/完成的推測(cè)*musthavedone,didn’t/hasn’tMustbedoing推測(cè)現(xiàn)在正在進(jìn)行Hemusthavegoneoverthearticle,hasn’the?Itmusthaverainedlastnigh
6、t,didn’tit?Dneedanddare過(guò)去時(shí)dared情態(tài)動(dòng)詞和實(shí)意動(dòng)詞的區(qū)別A人稱變化Bdo/todoC直接否定/間接否定canworkNeed/dare肯定句中，實(shí)義動(dòng)詞Sheneedstodoit.Idaretodoit.使用在否定句,疑問(wèn)句中，情態(tài)動(dòng)詞，實(shí)義動(dòng)詞。Idarenotdoit.Idon’tdare(to)doit.Ineednotdoit.Idon’tneedtodoit.1need情態(tài)動(dòng)詞無(wú)時(shí)態(tài)；人稱的變化多用于疑問(wèn)句和否定句Youneedn’ttrytoexplain
7、.Needn’t=don’thavetoNeedn’thavedonesth過(guò)去本不必做某事*虛擬語(yǔ)氣2need實(shí)義動(dòng)詞有時(shí)態(tài)；人稱的變化后接todoYouneedtotellusthetruth.Thecarneedsrepairing.Thecarneedstoberepaired.3dare情態(tài)動(dòng)詞過(guò)去時(shí)dared無(wú)人稱的變化多用在疑問(wèn)句和否定句Darehetellthemwhatheknows?4dare實(shí)義動(dòng)詞有時(shí)態(tài)；人稱的變化后接todo用于疑問(wèn)句和否定句時(shí)其后的to有時(shí)可省略Doyou
8、dare(to)jumpoffthehighwall?Ewillandwould1表示征求對(duì)方(第二人稱)意見(jiàn)或詢問(wèn)對(duì)方意愿would比will更客氣委婉Willyouhavesomemorewine?Wouldyoumindmysmokinghere?2will表示習(xí)慣性動(dòng)作或某種傾向would表示過(guò)去習(xí)慣性動(dòng)作或某種傾向Fishwilldieoutofwater.WhenIwasyoung,IwouldplaybadmintononSundays.Would與us
