1、,情态动词表示推测的用法,1.对现在(事情)推测,2.对过去(事情)推测,must +v. (肯定)might/could/may/can +v. (可能)cant+v. (不可能),1.must have done (表肯定性推测) “肯定,准是,”,cant /couldnt have done (表否定性推测)“不可能”,2.may/might have done(表可能性推测)可能,也 许,3.should/ought to have done(表本该做而实际未做的事),shouldnt/oughtnt to have done (表本不该做而实际 已做的事),4.neednt hav
2、e done(表本不必做而实际己做,造成浪, 费,遗憾,不好后果),情态动词表示推测的用法,1.对现在(事情)推测：（情态动词+ 动词原形）,must + v. (肯定)may/might/could/can+v. (可能) cant + v. (不可能),2.对过去(事情)推测：（情态动词+ 完成式）,must have done (表肯定性推测) “肯定,准是,”,cant /couldnt have done (表否定性推测)“不可能”,It must have rained last night,for the road is wet.(It cant/couldnt have rai
3、ned last night.),1.It must have rained last night.for the ditch(水道,渠道) is full of water.,2.-Can it have been a comfortable journey?,3.Ten passangers were in a car!It cant have been a comfortable jurnery.,4.He may have gone to Beijing yesterday. (可能性大)5He might have gone to Beijing yesterday. (可能性小),
4、6.There was plenty of time.She neednt have hurried.7 You should have come to the meeting.,1.- He must be Mr. Li.(肯定是)-No,he cant be Mr. Li. Mr.Li has gone to Britain.(不可能是),2.We may be late for class.Its already seven to five.(也许),3.You mustnt play with fire!,另外,在虚拟语气中还有: would have done 表示“本来会.” 但实
5、际上并没有发生,You should have come earlier, otherwise you would have met him.你本该早点来，否则的话，你就会遇见他（实际上没有早来，也没见到他）,must表推测的反意疑问句: 反意问句部分永远不带must. 1.She must be a teacher,isnt she?2.She must have gone to Shanghai, hasnt she?3.She must have gone to Shanghai yesterday, didnt she?,特殊疑问句疑问词+do you,Thinksuggestbelieveimaginesuppose say,+主语+谓语,(插入语),
