九年级英语情态动词表推测用法总结

1、九年级英语情态动词表推测用法总结(一)情态动词表推测的三种句D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 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

2、肯定把暖气关了。2 .否定句中用 can' t / couldnf可能),tmay not/might not风能不)。(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) 问句中用can/could能2)(1) Could he have finished the task?他可能把任务完成了吗？(2) Can he be at home n

3、ow?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"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

4、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 ( co

5、uld ) 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包去分词。(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 / C

6、ould 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茶应该做某事却没做例如：(4) It ' s seven o ' clock. Jack should/ought to bnyhmoment.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 afte

7、r 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。补充强调：推测的句型特点(对某一次的推测句型有两部分：语气和时态)(1)语气部分：(以下情态动词语气由强至弱)肯定何： must、may、might (=could)否定句：can' (=couldn ') t> mayn'、t mightn &#

8、39; t疑问句：can、could (语气更加委婉不确定)(2)时态部分：be表示对匠|的推测have done表示对|过去卜勺推测be doing表示对正在进行的推测语气部分写在前时态部分写在后，组合在一起就是推测(三)几组表推测的情态动词用法情态动词+完成时”是历年高考的热点，在做此类练习时，既需要掌握这一结构的基本用法，又应该仔细体会题干所提供的语言信息，准确理解语言环境和说话人的含义，尤其要注意题干中时态给予的暗示。l.must have done表示对已经发生的事情的推测，意为定，想必”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，其否定形式是can ' ( co

9、uldn )' have done ,表示 不可能，肯定不会”。例 如:He didn ' t hear the phone . He must have been asleep.他没有听到电话响，他肯定是已经睡着了。He must have been to Shanghai.他一定去过上海。They can t have gone out , because the light is on .他们不可能出去，因为灯亮着。2. can （could） have done表示对过去的时间内可能发生的事情的猜测，can have done 一般只用于否定句和疑问句。could ha

10、ve done 还可以用于肯定句，常用来表示本来可能完成而实际未完成的动作。例如：He can t have finished the work so soon.这项工作他不可能完成得这样快。We could have walked to the station , it was so near .我们本来是可以走到车站去的，路很近。3. may（ might） have done（ 1）表示对已经发生的事情的不太肯定的推测，意为“可能已经，或许已经”。（ 2）虚拟用法表示本可以做，但却没做（表示很委屈地责备）If we had taken the other road , we might

11、have arrived earlier.如果我们选择另一条路，我们可能会到得早一些。He might have given you more help, he was very busy.他本来是可以给你更多帮助的，尽管他很忙。4. needn ' t have don际上做了本来不必要做的事，意为茶来不必”。例如：There was plenty of time . She needn t have hurried.时间很充裕，她本不必匆忙。You needn t have told him the news.他本来不必把这个消息告诉他。5. should （ ought to ） have done 指本该做而实际未做的事，意为“本来应该 ”。其否定式shouldn t（ oughtn ） t have done 则表示某种行为不该发生但却发生了。例如：You should have started earlier , but you di dn t.你本应该早一点出发，但是你没有。You ought to have helped him （but you didn ）'. t你本应该帮助他。We