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 引导的感叹句中　 “但愿，要是…就好了”

[各个击破]

4．It is (high ) time that ….. 过去时/　 should + v.

3．as if ( though)引导的从句中

　 as if 后的从句当表示真实情况时，用陈述语气。试比较：

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

2.　　　 宾语从句中

wish , would rather 后,　 但would rather后所跟句子跟现在、将来相反用过去时，跟过去时间相反使用过去完成时。注意：不跟过去将来时。

　　　　 I would rather you came tomorrow instead of today.我宁愿你明天而不是今天来。

1.在条件句中的运用

　 1) “混合虚拟条件句”或“错综时间条件句”

　 主句和从句时间上不一致，从句可以和过去时间相反，主句可以与现在事实相反。

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

2) if 省略句。在条件句中，可省略if, 把were, had, should提到句首，变为倒装句式。

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

3) 含蓄条件句

　 A) with, without, but for 等介词短语代替条件句

　　 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.(副词)

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

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

　 Given more time, we could have done it better. (分词短语)

　 It would be a mistake not to help him.(动词不定式)

2．主语从句中

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：形式为在原本的时态上退一步，即“+过去”

[要点点拨]

一：形式为(should) +v.

1．宾语从句中。一个坚持(insist),两个命令(order, command), 三条建议(advise, suggest, propose),四项要求(demand, require, request, ask).还有prefer ，advise等词。

　 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) 这类动词的名词形式后的表语从句和同位语从句中也要用(should ) + v.形式。另外，还有plan, idea等词。