1、七情態(tài)動詞知識重點與難點總結(jié)知識重點:情態(tài)動詞在表達推測意義的句子中的運用:(一用情態(tài)動詞表達事實的推測。 can , could , might , may , must 可以用來表達對事實的 推測。根據(jù)說話人對事實的把握性大小, must 表示“肯定” , may / might / can / could表示 “可能” , must 只用于肯定句中, may / might的否定式 may not / might not表示 “可 能不” , 而 can / could可以用于疑問句,表示“可能,可能嗎 ? ” ,其否定式 can t / couldn t 表示 “不可能” 。 用情態(tài)動

2、詞可以對現(xiàn)在或過去的事實進行推測。 對不同的時間內(nèi) 容推測有不同的結(jié)構(gòu)。(二對現(xiàn)在的事實進行推測:主要結(jié)構(gòu): must / may / might +動詞原形be+名詞 /形容詞 /介詞短語be + doing例句:1. They must be in bed already at this time of the night.2. The teacher must be joking.3. Freda isnt in class. She must be sick.4. There must be something wrong.5. He may be arriving this even

3、ing.6. He may be traveling around the world.7. Can the news be true ?(三對過去的事實進行推測:結(jié)構(gòu):情態(tài)動詞 +have done / been+名詞 /形容詞 /介詞短語 例句:1. Mrs. Longmans must have been a pretty girl in her youth.2. He couldnt have seen Anna yesterday. Shes gone abroad.3. I think I must have left my glasses in the library.4. He

4、 might have overslept again.5. Where can Tom have gone?情態(tài)動詞表達虛擬語氣:表達“本來” , “不然早就” 。這是情態(tài)動詞的一種虛擬語氣用 法。 表示說話人所講的與所發(fā)生的事實相反。 表達了說話人的埋怨, 后悔的語氣。 其結(jié)構(gòu)是 在一些情態(tài)動詞后面加 have done 結(jié)構(gòu)。根據(jù)要表達的意思,有如下結(jié)構(gòu):should have done / ought to have done:本應(yīng)該shouldn t have done / oughtn t to have done:本不該could have done:本來可以needn t ha

5、ve done:本來沒必要would like to have done:本來很想would rather not have done: 本來不愿意could / might / have done: 不然早就例句:1. You shouldnt have laughed at his mistakes.2. You could have told us earlier.3. I ought to have bought that dictionary last week.4. You ought not to have spent so much time in reading novels

6、.5. We need not have been in a tearing hurry to catch the train.6. They would like to have seen that film last film.7. If he had given me his number, I could have telephoned him.8. They might have been frozen to death but for the rescue in time.知識難點:某些情態(tài)動詞的特殊用法:need 和 dare 的兩種形式的用法need 和 dare 可以用做實義

7、動詞,后面接不定式(to do結(jié)構(gòu),在疑問句和否定句中,加助 動詞 do/does/did/或 don t/doesn t/didn t 。作為情態(tài)動詞使用時,主要用于疑問句和否定 句中。情態(tài)動詞 needn t (沒有必要,不必相當(dāng)于 don t have to例句:1. It is cold, you need to wear some warm clothes.2. Need I stay here with you for a while ? Thank you, you neednt.3. How dare you speak to parents like that ?注意:句型

8、I dare say+從句。 意思是:我肯定 = I m sure或 There is no doubt that+從句。 例句:I dare say that my uncle will get the money if I die.will 和 would表示“意志”或“愿意” , would 則指過去愿意做例句:1. He said that he would help us.2. You may telephone if you will accept this job.would 可以表達“過去習(xí)慣做”類似于“ used to do”例句:1. When we were childr

9、en, we would go swimming every summer in that river.表示請求,固定的句型:Will/Would you please do ? / Would you like to do ?例句:Will/Would you please give him a message when you see him ?shall1. 用于第一,三人稱,表示“請求” ; “建議” 或“推薦”例句:1. Shall we start the meeting now?2. Shall I watch TV now ?3. Shall my son carry the

10、case for you ?2. 用于第二人稱,表示“命令, “要求” , “許諾”例句:1. You shall take whatever you like.2. You shall not go to the party with me if you make so much noise again.在表示推測的否定句或疑問句中, 常用 can /can t /could / couldn t 表示, 意思是:“可能 嗎 ? ” ; “不可能” 。而不能使用 mustn t 或 must 等詞?！镜湫屠}】1. Do you think he will do me a favor ? A

11、s far as I know, he is the last one to help others. He _ be prepared to give you a hand, though.A. might B. must C. can D. should2. Look, someone is coming. Guess who it _ be ? I think it _ be Tom. I dont think it _ be _ .A. can ; must ; can ; he B. may ; can ; must ; himC. must ; can ; must ; his D

12、. might ; must ; can ; himself3. Do you know Ms. Wang likes walking after supper ? Sure. She _ around the campus now.A. must be walking B. must walkC. may walk D. may be walking4. I stayed at a hotel in New York. Oh, did you ? You _ with Barbara.A. could have stayed B. could stay C. would say D. mus

13、t have stayed5. Why didnt you tell me there was no meeting today ? I _ all the way here through the heavy snow.A. neednt have driven B. cant have drivenC. mustnt have driven D. shouldnt have driven6. I was really anxious about you. You _ home without a word.A. mustnt leave B. shouldnt have leftC. co

14、uldnt have left D. neednt leave7. A:Are you coming to Jeff s party ?B :I m not sure. I _ go to the concert instead.A. must B. would C. should D. might8. A:I promise that she _ get a nice present on her birthday.B :Will it be a big surprise to her ?A. should B. must C. would D. shall【模擬試題】1. A:Is Joh

15、n coming by train ?B :He should, but he _ not. He likes driving his car.A. must B. can C. need D. may2. Mr. White _ at 8:30 for the meeting, but he didnt show up.A. should have arrived B. should arriveC. should have had arrived D. should be arriving3. Sorry, Im late. I _ have turned off the alarm and gone to sleep again.A. might B. should C. can D. will4. You _ be tiredY ouve only been working for an hour.A. must not B. wont C. cant D. may not5. I didnt go to work yesterday afternoon because my car broke down. Y ou _ mine. I wasnt using it.A. m