They shouldn't have left so soon.

　　They must have been through a lot.

　　I needn't have told them that.

　　He can't have left for Shanghai for I saw him a moment ago.

　　How could you have forgotten such an important thing?

　　They must have arrived by now.

　　You oughtn't to have done that.

　　She looks so miserable. You oughtn't to have hurt her feelings.

　　"I was late yesterday because my car broke down. "(broke的原型是break，這里表拋錨的意思) "You should have borrowed mine. I wasn't using it. "

　　情態(tài)動(dòng)詞部分除了應(yīng)了解每個(gè)詞的具體含義之外，情態(tài)動(dòng)詞的否定是在后面加not.特別要注意had bette和would rather的否定。ought to的否定是ought not to.would rather后面接句子只能用一般過(guò)去時(shí)。can、could、may、might、must、ought to、should后接動(dòng)詞完成式表示對(duì)過(guò)去事情的猜測(cè)。

　　"may/might + 現(xiàn)在完成時(shí)"表示"也許已經(jīng)……了";

　　"must + 現(xiàn)在完成時(shí)"表示"肯定……了";

　　"can / could + 現(xiàn)在完成時(shí)"表示"本來(lái)是能夠……的(實(shí)際上未)";

　　"should/ought to + 現(xiàn)在完成時(shí)"表示"本應(yīng)該……(實(shí)際上未)".

　　2.The house is dark; the Browns _______ to bed.

　　A. may go B. should go C. should have gone D. must have gone

　　(答案 D)

　　3.Her husband could have helped her， but he chose not to.(choose)

　　4.You _______ yesterday if you were really serious about the job.

　　A.ought to come B. ought come C. ought to have come D. ought have come

　　(答案 C serious 嚴(yán)肅的)

　　此外，考生還應(yīng)注意need和dare這兩個(gè)詞，它除了是情態(tài)動(dòng)詞外，還可以是實(shí)義動(dòng)詞，在不同的情況下用法有差別

　　1.To travel from England to Scotland you _______ a passport.

　　A. mustn't have B. haven't got C. don't need D. needn't

　　(情態(tài)動(dòng)詞后要接動(dòng)詞原型 答案 C)

　　2.The house needs ________， but they plan to wait until next spring to do it.

　　A. paint B. to paint C. painting D. be painted

　　(答案 C)

　　1. "Do you have to leave?"

　　"Sorry ， but I really _____."

　　A. have B. had to C. do so D. must

　　答案 D

　　2. I want to go to the dentist， but you ________ with me.

　　A. needn't to go B. needn't go

　　C. don't need go D. need go

　　neen't為情態(tài)動(dòng)詞，后接動(dòng)詞原型

　　don't need為實(shí)義動(dòng)詞，后面接to

　　答案 B
       
         3. "______ you pass me the salt?"

　　"Sure. Here you are ."

　　A. Might B. Must C. Could D. Need

　　答案 C

　　4. "I haven't felt well for a week."

　　"You ______ see a doctor."

　　A. have ought ot B. had better

　　C. should have to D. would rather

　　答案 B

　　5. "Doesn't Elaine want to see that movie?"

　　"Yes， but she says _______ go tonight."

　　A. she'll rather not B. she'd rather not

　　C. she'd not rather D. she won't rather

　　would rather的否定詞放在rather的后面，動(dòng)詞的前面。

　　答案 B

　　6. "Listen， Mary is singing in the next room."

　　"That ______ be Mary. She's in hospital."

　　A. may not B. shouldn't C. should have gone D. can't

　　答案 D

　　7. John ______ a restless person. He kept moving from country to country.

　　A. must be B. should go C. must have been D. must have gone

　　答案 C

        　8. I can't find Tom anywhere. I think he ____ to the library.

　　A. may go B. must go C. must have gone D. should have gone

　　should have gone 應(yīng)該……而實(shí)際上沒(méi)……

　　答案 C

　　9. "What's the matter with that picture on the wall?"

　　"It needs _________."

　　A. straightening B. to be straightening C. straightened D. straighten

　　答案 A

　　10. "Tom graduated from college at a very young age."

　　"He _________ an outstanding student."

　　A. must be B. could be C. must have been D. should have been

　　對(duì)過(guò)去推測(cè)，情態(tài)動(dòng)詞后接現(xiàn)在完成時(shí)。

　　答案 C

　　11. The old lade needs ________ after her shock.

　　A. to comfort B. comforting C. to be comforted D. Both B and C

　　答案 D