情态动词表推测用法总结(整理稿)(共3页).doc
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1、精选优质文档-倾情为你奉上情态动词表推测用法总结(一)情态动词表推测的三种句式 能用于表推测的情态动词:must, can, could, will, would, may, might, should, ought to1.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
2、. 屋里很冷,他们肯定把暖气关了。 2.否定句中用cant / couldnt(不可能), may not/might not(可能不)。 (1)It cant/couldnt 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?
3、 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
4、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 cant ( couldnt ) / 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 lat
5、e 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
6、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)Its seven oclock. 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
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