1、情态动词表示推测使用方法情态动词表示推测使用方法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.(必定必定)might/could/may/can+v.(可能可能)cant+v.(不可能不可能)1.must have done (表必定性推测表必定性推测)“必定必定,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事表本该做而实际未做事)sh
2、ouldnt/oughtnt to have done(表本不该做而实际表本不该做而实际 已做事已做事)4.neednt have done(表本无须做而实际己做表本无须做而实际己做,造成浪造成浪,费费,遗憾遗憾,不好后果不好后果)第1页情态动词表示推测使用方法情态动词表示推测使用方法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.(必定必定)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）must have done (表必定性
3、推测表必定性推测)“必定必定,准是准是,”cant/couldnt have done(表否定性推测表否定性推测)“不可不可能能”It must have rained last night,for the road is wet.(It cant/couldnt have rained last night.)第2页1.It must have rained last night.for the ditch(水道水道,渠道渠道)is full of water.2.-Can it have been a comfortable journey?3.Ten passangers were in
4、 a car!It cant have been a comfortable jurnery.第3页4.He may have gone to Beijing yesterday.(可能性大可能性大)5He might have gone to Beijing yesterday.(可能性小可能性小)第4页6.There was plenty of time.She neednt have hurried.7 You should have come to the meeting.第5页1.-He must be Mr.Li.(必定是必定是)-No,he cant be Mr.Li.Mr.Li
5、 has gone to Britain.(不可能是不可能是)2.We may be late for class.Its already seven to five.(可能可能)3.You mustnt play with fire!第6页另外另外,在虚拟语气中还有在虚拟语气中还有:would have done 表示表示“原来会原来会.”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，不然话，你就会遇见他你本该早点来，不然话，你就会遇见他（实际上没有早来，也没见到他）（实际上没有早来，也没见到他）第7页must表推测反意疑问句表推测反意疑问句: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,isnt she?2.She must have gone to Shanghai,hasnt she?3.She must have gone to Shanghai yesterday,didnt she?第8页特殊疑问句特殊疑问句疑问词疑问词+do youThinksuggestbelieveimaginesuppose say+主语主语+谓语谓语 (插入语插入语)第9页
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