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1、ModalVerbs情态动词(A):情态动词的基本用法:(1)后接动词原形(2).否定句:后加not(3).疑问句:提前(1).Weshouldcareforothers.(2).Icannotswim.(3).MayIcomein?一..can,could1.表能力:能,会(1).CanyouspeakEnglish?(2).Ican’tswim.2.表许可:可以(1).CanIuseyourtelephone?Yes,youcan.No,youcan’t.CouldIuseyourtelephone?Yes,youcan.No,youcan’t.(could语气委婉)(2).Youc
2、an’tparkyourcarhere.(不可以)3.特殊句式(1).cannot/never…too…或can’t…enough越…越好,无论怎样也不过分Youcan’tbetoocareful.越认真越好.Youcan’tworktoohard.工作越努力越好.Ican’tthankyouenough.感激不尽.(2).can’thelpdoingsth.,情不自禁can’tbutdoHecouldn’thelpcrying.Whenaclosefrienddies,youcan’tbutfeelsad.can与beableto的区别(1).时态:can只有一般现在时can和过去时c
3、ould,而beableto有各种时态(2).主语:can的主语指人也指物,而beableto只指人二.may,might1.表许可MayIcomein?Yes,youmay.No,youmustn’t.MightIcomein?Yes,youmay.No,youmustn’t.(语气委婉)2.表祝愿Mayyousucceed.Mayyouliveto100years.MayGodbewithyou.(愿上帝保佑你.)3.用于目的状语从句和让步状语从句中(1).HespeaksEnglishslowlysothat(inorderthat)hisstudentsmay(can)follo
4、whim.(2).Whateverhemaysay,Idon’tbelievehime.4.特殊结构may/mightaswelldosth.还是做…的好YoumayaswellgotoBeijingnextMonday.Sincewehavenothingtodo,wemayaswellgoforawalk.三.must1.表命令,义务:必须,必要(1).MustIgonow?Yes,youmust.No,youneedn’t.(2).Youmustdoasyouaretold.(3).Carsmustn’tbeparkedhere.mustn’t不准,不允许,needn’t不必,没必
5、要第1页2.表必然性:不免,肯定(1).Allmenmustdie.人不免一死.(2).Carelessreadingmustgivebutpoorresults.读书不用功,成绩肯定不好.3.表固执:硬要,偏要Whymustyoubesostubborn?你为什么偏要这么固执呢?Ifyoumustknowwhy,I’lltellyouthereason.四.shall1.用于第一人称的问句,征求对方的意见或指示(1).ShallIshutthedoor?Yes,please.对比MayIhavealook?我可以看一下吗?Yes,youmay.ShallIhavealook?我看一下好
6、吗?Yes,please.2.用于二,三人称,表命令,允若,警告,决心(1).Youshall(must)gotothefront前线atonce.(命令)(2).Don’tworry.Youshallgettheanswerthisafternoon.(允若)(3).Heshallbesorryoneday.Itellyou.(警告)(4).Nothingshallstopusfromfightingagainstpollution.(决心)3.用于法律,条文中(1).Thefineshallbegivenincash.罚款应以现金交纳.(2).Itshallbeunlawfulfor
7、anypersontokeepanywildanimalincaptivity.任何人圈养任何野生动物都是违法的.五.should1.表义务,责任:应该Youshouldapologizetohim.Weshouldattendthemeeting.2.表惊讶,遗憾:竟然,居然(1).I’msurprisedthatyoushouldspeakinsuchaway.(2).I’mgladthatyourstoryshouldwint
