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1、He be Curnane!,He be thinking.,He be a common boy.,情态动词表推测,must,might,cant,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。,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
2、，很有可能）,（可能）,（可能）,（可能）,肯定推测,最 强,最 弱,must,might,can,could,may,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,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,could
3、nt,may not,（不用于推测）,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。,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”
4、 “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,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,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,表对已经发生的事情的推测，意为“一
5、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,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 finish
6、ed 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)”,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 hel
7、p, but he was very busy.,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,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. T
8、he 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,6. Its the library! So you _
9、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,
