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2019年中考英语复习之情态动词表推测

2018-09-10 14:55:17中考网编辑
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  情态动词表推测的用法小结

  (一)情态动词表推测的三种句式

  1.在肯定句中一般用must (一定),may(可能),might / could(也许,或许)。

  (1)He must/may/might know the answer to this question?

  他一定/可能/也许知道这个问题的答案。

  (2)It is cold in the room. They must have turned off the heating.

  屋里很冷,他们肯定把暖气关了。

  2.否定句中用can’t / couldn’t(不可能), may not/might not(可能不)。

  (1)It can’t/couldn’t be the headmaster. He has gone to America.

  这不可能是校长,他去美国了。

  (2)He may not/might not know the scientist. 他也许不认识那位科学家。

  3.疑问句中用can/could (能……?)。

  (1)Could he have finished the task? 他可能把任务完成了吗?

  (2)Can he be at home now? 他现在能在家吗?

  注:以上三种句式中情态动词的语气按程度都是依次递减的。Might, could并非may, can的过去式,而表示语气较为委婉或可能性较小。

  (二)情态动词表推测的三种时态

  1.对将来情况的推测,用“情态动词 + 动词原形”。

  (1)She must / may / might / could arrive before 5.      5:00前她一定/可能/也许到。

  (2)She must/may/might/could walk miles and miles among the hills without meeting anyone.

  她一定/可能/也许会在山里一连走好几英里而遇不到一个人。

  2.对现在或一般情况的推测,用“情态动词 + be”,“情态动词 +be doing”或“情态动词 + 动词原形”。

  (1)He must / may / might / could be listening to the radio now.

  他一定/可能/也许正在听收音机。

  (2)He can’t ( couldn’t ) / may ( might ) not be at home at this time.

  这个时候他不可能/可能不在家。

  (3)Mr. Bush is on time for everything .How can ( could ) he be late for the opening ceremony ?

  布什先生一向准时,这次开幕式他怎么可能迟到呢?

  3.对过去情况的推测,用“情态动词 + have +过去分词”。

  (1)It must / may / might / could have rained last night .The ground is wet.

    地湿了,昨晚肯定/可能/也许下雨了。

  (2)The door was locked. He can ( could ) not / may ( might ) not have been at home .

    门锁着,他不可能/可能不在家。

  (3)Can / Could he have gotten the book?

    难道他找到书了吗?

  注:情态动词 should /ought to表推测时,意为“想必会,理应……”但与“have +过去分词”连用时,则又可构成虚拟语气意为“本应该做某事却没做”。例如:

  (4)It’s seven o’clock. Jack should/ought to be here at any moment.

  现在七点钟了,杰克理应随时到达。(推测)

  (5)She should / ought to have attended your birthday party, but she had to look after her mother in hospital. (虚拟) 她本该出席你的生日晚会的,可是她得在医院照顾她妈妈。

  (6)Tom should not /ought not to have told me your secret, but he meant no harm. (虚拟) 汤姆本不该告诉我你的秘密,可是他并无恶意。

 

编辑推荐:2019年中考英语语法专题整理之情态动词

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