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1.当从句的谓语动词含有were, should, had时, if可以省略, 这时从句要用倒装语序,即把were, should, had等词置于句首,这种多用于书面语。

例:

Should he agree to go there,we would send him there.

要是他答应去的话,我们就派他去了。

Were she here,she would agree with us.

如果她在这儿的话,她会同意我们的。

Had he learned about computers,we would have hired him to work here.

如果他懂一些电脑知识的话,我们已经聘用他来这里工作了。

2.非真实条件句中的条件从句有时不表达出来,只暗含在副词、介词短语、上下文或其他方式表示出来,这种句子叫做含蓄条件句,在多数情况下,条件会暗含在短语中,如without…,but for…(要不是因为...)等

例:

But for his help, we would be working now.

要不是他的帮助,我们还会在工作呢。

Without your instruction, I would not have made such great progress.

要是没有你的指导,我不会取得如此大的进步。

We didn't know his telephone number, otherwise we would have telephoned him.

我们不知道他的电话号码,否则我们就会给他打电话。

3.有时,虚拟条件语气的从句中, 主、从句可以省略其中的一个, 来表示说话人的一种强烈的感情。

①省略从句

He would have finished it.

他本该完成了。

You could have passed this exam.

你本能通过这次考试的。

②省略主句

If I were at home now.

要是我现在在家里该多好啊。

If only I had got it.

我要是得到它了该多好啊。

4.注意,在虚拟语气的从句中, 动词be的过去时态一律用were,不用was

If I were you, I would go to look for him.

如果我是你,就会去找他。