情态动词表示推测

1、情态动词表示推测的用法情态动词表示推测的用法1.对现在对现在(事情事情)推测推测 2.对过去对过去(事情事情)推测推测must +v. (肯定肯定)might/could/may/can +v. (可能可能)cant+v. (不可能不可能)1.must have done (表肯定性推测表肯定性推测) “肯定肯定,准是准是,” cant /couldnt have done (表否定性推测表否定性推测)“不可能不可能”2.may/might have done(表可能性推测表可能性推测)可能可能,也也 许许3.should/ought to have done(表本该做而实际未做的事表本该做而

2、实际未做的事)shouldnt/oughtnt to have done (表本不该做而实际表本不该做而实际 已做的事已做的事)4.neednt have done(表本不必做而实际己做表本不必做而实际己做,造成浪造成浪, 费费,遗憾遗憾,不好后果不好后果)情态动词表示推测的用法情态动词表示推测的用法1.对现在对现在(事情事情)推测：推测：（情态动词（情态动词+ 动词原形）动词原形） must + v. (肯定肯定)may/might/could/can+v. (可能可能) cant + v. (不可能不可能)2.对过去对过去(事情事情)推测：推测：（情态动词（情态动词+ 完成式）完成式）mu

3、st have done (表肯定性推测表肯定性推测) “肯定肯定,准是准是,”cant /couldnt have done (表否定性推测表否定性推测)“不可能不可能”It must have rained last night,for the road is wet.(It cant/couldnt have rained last night.)1.It last night.for the ditch(水道水道,渠道渠道) is full of water.2.-it have been a comfortable journey?3.Ten passangers were in a

4、 car!It a comfortable jurnery.4.He to Beijing yesterday. (可能性大可能性大)5He to Beijing yesterday. (可能性小可能性小)6.There was plenty of time.She 1.- He must be Mr. Li.(肯定是肯定是)-No,he cant be Mr. Li. Mr.Li has gone to Britain.(不可能是不可能是)2.We may be late for class.Its already seven to five.(也许也许)3.You mustnt play

5、with fire!另外另外,在虚拟语气中还有在虚拟语气中还有: would have done 表示表示“本来会本来会.” 但实际上并没有发生但实际上并没有发生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）他（实际上没有早来，也没见到他）must表推测的反意疑问句表推测的反意疑问句: 反意问句部分永远不带反意问句部分永远不带must. 1.She must be a teacher, she?2.She must have gone to Shanghai, ?3.She must have gone to Shanghai yesterday, s