3. ____ it would stop snowing !　　　

　 A. If only　 B. Only if　　 C. Even if　 D. But for

2. She suggested to the police in the police station that Mr. Smith ____.　　　

　 A. stole the necklace　　 B. should steal the necklace　

　C. had stolen the necklace　 D. steal the necklace

1. I could have called you for help, but I ____ your number.　

　 A. couldn’t have remembered　　 B. didn’t remember

　 C. should have remembered　 D. hadn’t remembered

5.　 用于if only 引導(dǎo)的感嘆句中　 “但愿，要是…就好了”

[各個擊破]

4．It is (high ) time that ….. 過去時/　 should + v.

3．a(chǎn)s if ( though)引導(dǎo)的從句中

　 as if 后的從句當(dāng)表示真實情況時，用陳述語氣。試比較：

It looks as if it is going to rain. /　 He talks as if he had been to America,

2.　　　 賓語從句中

wish , would rather 后,　 但would rather后所跟句子跟現(xiàn)在、將來相反用過去時，跟過去時間相反使用過去完成時。注意：不跟過去將來時。

　　　　 I would rather you came tomorrow instead of today.我寧愿你明天而不是今天來。

1.在條件句中的運用

　 1) “混合虛擬條件句”或“錯綜時間條件句”

　 主句和從句時間上不一致，從句可以和過去時間相反，主句可以與現(xiàn)在事實相反。

If you had taken my advice just now, you would be better now.

2) if 省略句。在條件句中，可省略if, 把were, had, should提到句首，變?yōu)榈寡b句式。

　Were I you, I would seize the chance to go abroad.

3) 含蓄條件句

　 A) with, without, but for 等介詞短語代替條件句

　　 But for the rain, the crops would have died. (= If it hadn’t been for the rain)

　 B) 其他手段

　 I was ill that day. Otherwise, I would have taken part in the sports meeting.(副詞)

　 He telephoned to inform me of your birthday, or I would have known nothing about it.(連詞)

　I might have given you more help, but I was too busy. (連詞)

　 Given more time, we could have done it better. (分詞短語)

　 It would be a mistake not to help him.(動詞不定式)

2．主語從句中

1) It is necessary / important / strange / natural / a pity / a shame / no wonder … that….

eg. It is strange that he should have acted towards his parents like that.

二：形式為在原本的時態(tài)上退一步，即“+過去”

[要點點撥]

一：形式為(should) +v.

1．賓語從句中。一個堅持(insist),兩個命令(order, command), 三條建議(advise, suggest, propose),四項要求(demand, require, request, ask).還有prefer ，advise等詞。

　 注意：1)suggest和insist有例外

The smile on his face suggested that he was satisfied with our work.(“暗示”“表明”)

The man insisted that he had never stolen the money.

　 　　2) 這類動詞的名詞形式后的表語從句和同位語從句中也要用(should ) + v.形式。另外，還有plan, idea等詞。