modalverbs课件
日期:2010-10-19 10:27
情态动词用于否定,should过去式语气更委婉EgYoushouldhavebeenfiveminutesagoYoushallgetabikeifyoubehavewellthesedaysWill/would1,而mustn’t表示“禁止,RevisionforModalVerbsMarch,shall/should+have+ppoughtto表示本应该做而未做,2在肯定句中表示“本来可以做而未做”ThedoorwaslackedShecouldn’thavebeenathomeYoucouldhavebeenmorecareful1MayMight过去式;语气更委婉1在否定,EgHeusedtobeaworker1,表“劝告,”Eg1Shemaybestillwaitingforus2MayIcomein?3MayyouhaveahappyholidayEg1Hemighthavespokentoheryesterday2Youmighthavetoldmeearlier1Must表示肯定的猜测,EgTheroadidwetItmusthaverainedlastnight1,2,但只用于肯定句,二者可以互换,疑问句中表示“对过去发生行为的可能性猜测,疑问句;条件从句中,2005●ThebasicusesofModalVerbs1CanCould过去式;语气更委婉Can表示习惯能力,肯定句中表示对过去动作的推测“也许是……”2Might+have+pp表示虚拟,而beableto表示经过那里而做成了某事,Would后只能接表示动作的动词,usedto则还可以接表示状态的动词,Shall/should2,不准”Must表示主观Haveto表示客观需求Havegotto多见于口语3must+have+pp对过去事情的肯定猜测,责备之意,1在否定,2在否定结构中,eg1Dareyougoherealo,
查看全部