2020云南军队文职考试大纲《英语》考点：情态动词(4)

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”。

　　e.g:(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。长理职培教育军队考试网

　　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”。

　　e.g:(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”。

　　e.g:(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。