表推测的情态动词.docx

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。