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7. 某些用虛擬語氣的主語從句

形容詞important, impossible, necessary等后的主語從句通常用虛擬語氣：

It is impossible that he should go home. 他不可能會回家去。

It is necessary that I should return it right now. 我有必要馬上還回去。

注：(1) 在現代英語中，有時也可不用虛擬虛擬語氣而用陳述語氣，但初學者宜慎用。

(2) 在It is amazing (strange, surprising, astonishing, a pity, a shame)以及 I am surprised (sorry) 和I regret等結構后的that 從句中有時也用should，表示說話人的驚異、懊悔、失望等情感，常含有“竟然”之意。如：

It’s strange that he should be so rude. 他竟如此無禮，真是奇怪。

I’m surprised that he should have failed. 他竟然失敗了，這使我很吃驚。

若不用虛擬語氣也可以，則不帶感色彩，比較：

It’s a pity that he failed the exam. 他考試沒及格，真是遺憾。

It’s a pity that he should have failed the exam. 他考試竟沒及格，真是遺憾。

四、重點考點原創精練

1. If he was here, he _______ us how to do it.

A. told                      B. would tell             C. had told                D. had told

2. If we _____ 200 years old, we _____ everything.

A. were to be, could change                       B. had been, changed

C. were, would have changed                     D. should be, changed

3. If your father ______this, he would be angry.

A. knows                  B. knew                    C. had known            D. would know

4._______ your address, I would have written to you. 

A. Did I know           B. Were I to know C. Had I known             D. If I should know

5.______ he fail, he would kill himself.

A. Should                 B. Would                  C. Had                      D. If 

6. The doctor insisted that I ______ the medicine, but I insisted that I ______ ill.

A. take, wasn’t          B. should take, be      C. take, should be      D. took, should be

7.I wish you _______ him my telephone number, but you did.

A. didn’t give            B. hadn’t given          C. wouldn’t give        D. shouldn’t give

8. “Shall I open the window?” “I’d rather you ______.”

A. can’t                    B. won’t                   C. didn’t                   D. hadn’t

9. It’s already 12 o’clock. It’s high time you ____to bed.

A. went                    B. had gone               C. would go              D. go

10. I’m really busy, or I ____ with you.

A. will go                 B. went                     C. would go              D. have gone

11. It was lucky. Meeting anywhere else, we ____ each other.

A. couldn’t have recognized                       B. hadn’t recognize

C. couldn’t recognized                               D. didn’t recognize

12. It’s possible that he _____ us some money, but it’s impossible that he _____ us so much.

A. will lend, will lend                                B. will lend, should lend

C. should lend, will lend                            D. should lend, should lend 

13. Thank you very much indeed. If it had not been for your advice I really _____ what I should have done.

A. don’t know           B. didn’t know          C. hadn’t known        D. wouldn’t have known 

14. “It looks as if he were drunk.” “So it does. _____.”(m.52ysedu.com)

A. He’d better give up drinking                  B. He shouldn’t have drunk so much

C. Health is more important than drink        D. I wonder why he is always doing so 

15. “Mary looks hot and dry” “So _____ you if you had a high fever.”

A. do                        B. are                       C. will                      D. would          

參考答案：1—5 BABCA  6—10 BBCAC  11—15 ABADD

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