九年級英語情態(tài)動詞表推測用法總結

1、九年級英語情態(tài)動詞表推測用法總結(一)情態(tài)動詞表推測的三種句D能用于表推測的情態(tài)動詞：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 (也許，或許)。(1) He must/may/might know the answer to this question?他一定/可能/也許知道這個問題的答案。(2) It is cold in the room. They must have turned off the heating.屋里很冷，他們

2、肯定把暖氣關了。2 .否定句中用 can' t / couldnf可能),tmay not/might not風能不)。(1) It can ' t/couldn ' t be the headmaster. He has gone to America.這不可能是校長，他去美國了。(2) He may not/might not know the scientist.他也許不認識那位科學家。(3) 問句中用can/could能2)(1) Could he have finished the task?他可能把任務完成了嗎？(2) Can he be at home n

3、ow?他現在能在家嗎？注：以上三種句式中情態(tài)動詞的語氣按程度都是依次遞減的。Might, could并非may, can的過去式，而表示語氣較為委婉或可能性較小。(二)情態(tài)動詞表推測的三種"態(tài)1.對將來情況的推測，用情態(tài)動詞+動詞原形”。(1) She must / may / might / could arrive before 5.5:00前她一定/可能/也許到。(2) She must/may/might/could walk miles and miles among the hills without meeting anyone.她一定/可能/也許會在山里一連走好幾英里

4、而遇不到一個人。2 .對現在或一般情況的推測，用情態(tài)動詞+ be",情態(tài)動詞+be doing"或情態(tài)動詞+ 動詞原形”。(1) He must / may / might / could be listening to the radio now.他一定/可能/也許正在聽收音機。(2) He can ' t ( couldn ' t ) / may ( might ) not be at home at this time.這個時候他不可能/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 ?布什先生一向準時，這次開幕式他怎么可能遲到呢？3 .對過去情況的推測，用|情態(tài)動詞+ have包去分詞。(1) It must / may / might / could have rained last night .The ground is wet.地濕了，昨晚肯定/可能/也許下雨了。(2) The door was locked. He can ( could ) not / may ( might ) not have been at home .門鎖著，他不可能/可能不在家。(3) Can / C

6、ould he have gotten the book ?難道他找到書了嗎？注：情態(tài)動詞 should /ought to表推測時，意為 想必會，理應 "但與"have過去分詞”連用時，則又可構成虛擬語氣意為茶應該做某事卻沒做例如：(4) It ' s seven o ' clock. Jack should/ought to bnyhmoment.現在七點鐘了，杰克理應隨時到達。(推測)(5) She should / ought to have attended your birthday party, but she had to look afte

7、r her mother in hospital.(虛擬)她本該出席你的生日晚會的，可是她得在醫(yī)院照顧她媽媽。(6) Tom should not /ought not to have told me your secret, but he meant no harm. (虛擬)湯姆本不該告訴我你的秘密，可是他并無惡意。補充強調：推測的句型特點(對某一次的推測句型有兩部分：語氣和時態(tài))(1)語氣部分：(以下情態(tài)動詞語氣由強至弱)肯定何： must、may、might (=could)否定句：can' (=couldn ') t> mayn'、t mightn &#

8、39; t疑問句：can、could (語氣更加委婉不確定)(2)時態(tài)部分：be表示對匠|的推測have done表示對|過去卜勺推測be doing表示對正在進行的推測語氣部分寫在前時態(tài)部分寫在后，組合在一起就是推測(三)幾組表推測的情態(tài)動詞用法情態(tài)動詞+完成時”是歷年高考的熱點，在做此類練習時，既需要掌握這一結構的基本用法，又應該仔細體會題干所提供的語言信息，準確理解語言環(huán)境和說話人的含義，尤其要注意題干中時態(tài)給予的暗示。l.must have done表示對已經發(fā)生的事情的推測，意為定，想必”句子中表示的是一種肯定的推測。這種結構一般只用于肯定句，其否定形式是can ' ( co

9、uldn )' have done ,表示 不可能，肯定不會”。例 如:He didn ' t hear the phone . He must have been asleep.他沒有聽到電話響，他肯定是已經睡著了。He must have been to Shanghai.他一定去過上海。They can t have gone out , because the light is on .他們不可能出去，因為燈亮著。2. can （could） have done表示對過去的時間內可能發(fā)生的事情的猜測，can have done 一般只用于否定句和疑問句。could ha

10、ve done 還可以用于肯定句，常用來表示本來可能完成而實際未完成的動作。例如：He can t have finished the work so soon.這項工作他不可能完成得這樣快。We could have walked to the station , it was so near .我們本來是可以走到車站去的，路很近。3. may（ might） have done（ 1）表示對已經發(fā)生的事情的不太肯定的推測，意為“可能已經，或許已經”。（ 2）虛擬用法表示本可以做，但卻沒做（表示很委屈地責備）If we had taken the other road , we might

11、have arrived earlier.如果我們選擇另一條路，我們可能會到得早一些。He might have given you more help, he was very busy.他本來是可以給你更多幫助的，盡管他很忙。4. needn ' t have don際上做了本來不必要做的事，意為茶來不必”。例如：There was plenty of time . She needn t have hurried.時間很充裕，她本不必匆忙。You needn t have told him the news.他本來不必把這個消息告訴他。5. should （ ought to ） have done 指本該做而實際未做的事，意為“本來應該 ”。其否定式shouldn t（ oughtn ） t have done 則表示某種行為不該發(fā)生但卻發(fā)生了。例如：You should have started earlier , but you di dn t.你本應該早一點出發(fā)，但是你沒有。You ought to have helped him （but you didn ）'. t你本應該幫助他。We