8.情态动词表推测(课堂PPT).ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,He be Curnane!,He be thinking.,He be a common boy.,情态动词表推测,must,might,cant,1,表推测的三种句式,The light is on,so somebody _ be at home.,must,The light is on,so my sister _ be at home.,may,/,might,1.,在肯定句中一般用,must,may/might,，,语气,逐渐减弱。,2,常用于表推测的情态动词,will,would,ought to,should,（一定）,（可能）,（很有可能）,（很有可能）,（应该，很有可能）,（应该，很有可能）,（可能）,（可能）,（可能）,肯定,推,测,最 强,最 弱,must,might,can,could,may,3,Its sunny.It _ rain.,cant,表推测的三种句式,2.,在否定句中用,cant/couldnt(,不可能,),，,may not/might not(,可能不,),。,He _ know how to answer this question.,/,might not,may not,4,常用于表推测的情态动词,（,禁止,不许,）,（可能）,（,肯定不,不可能,）,（,肯定不,不,可能）,（可能,不,）,否,定,推,测,最 强,最 弱,must not,might not,cant,couldnt,may not,（,不用于推测,）,5,表推测的三种句式,3.,在疑问句中，一般只使用,can/could,。,she have finished her homework,?,your sister be at home now,?,Could,Can,【,口诀,】,can,不肯，,may/could/might,不问，,must,不否问,注：,can,表示推测时，不用于肯定句；,may/might/could,表示推测时，不用于疑问句；,must,表示推测时，不用于否定句或疑问句。,6,情态动词表推测的三种时态,He _ to music.,对现在或一般情况的推测,“,情态动词,+,be,”,“,情态动词,+,be doing,”,“,情态动词,+,动词原形,”,must be listing,He _ at home now.The light isnt on.,cant be,He _ in his office.,may work,7,情态动词表推测的三种时态,She _ very happy when she opens the door.,对将来推测，“情态动词,+,动词原形”,must be,8,情态动词表推测的三种时态,The ground is wet.It _ yesterday night.,对过去或已经完成的推测，“情态动词,+have+,过去分词”,may have rained,9,表对已经发生的事情的推测，意为“一定，想必”，在句子中表示的是一种肯定的推测。这种结构一般只用于肯定句,。,对过去推测的几组用法,1.must have done,否定形式：,cant(couldnt)have done,They out,because the light,is,still on.,He,didnt hear,the phone.He asleep.,“不可能，肯定不会”,must have been,cant have gone,10,表对过去的时间里可能发生的事情的推测，一般只用于否定句和疑问句。,对过去推测的几组用法,2.can/could have done,He,cant have finished,the work so soon.,用于肯定句中，常用来表示本来可以完成而实际未完成的动作。,We,could have walked,to the station,it was so near.,“本来能做,.(,而实际上没做,),”,11,1),表对已经发生的事情不太肯定的推测，意为“可能已经，或许已经”,对过去推测的几组用法,3.may/might have done,2),虚拟用法,：,表可以做，但却没有做。,If we had taken the other road,we,might have arrived,earlier.,He,might have given,you more help,but he was very busy.,12,推,测,三种句式,否定,肯定,疑问,常用于表推测的情态动词,否定,肯定,情态动词,表推测的三种时态,将来,现在,/,一般,过去,/,完成,几组,对过去,的,推测,can/could have done,must have done,may/might have done,13,Exercise:,1.Whose earrings are these?They _,be Marys.She wears earrings sometimes.,2.Carls,_,come to the party tonight,but Im not sure.,3.The telephone is ringing,but nobody answer it,he,_,be at home.,4.-Is this Lan Qiangs boxing glove?,-Yes,it,_,be his.This is his name on the back.,5.Youd better take an umbrella.It _rain this afternoon.,may/could/might,must,may/might/could,cant,may/might/could,14,6.Its the library!So you _ know shouting is not allowed here.,7.-Have you decided where to spend your summer holiday?,-Not yet.We _ go to Qingdao.,8.-Is Jessica giving us a speech this evening?,-No,it _ be her.She has gone to Japan.,9.-What will the weather be like tomorrow?,-It _ be rainy,cloudy,or sunny.Who know?,10.You _ be tired after playing sports for a long time without a rest.,must,may,cant,might,must,15,