有时为了考虑句子平衡,通常在主语从句处使用形式主语 it,而将真正的主语从句移至句末。这分三种情况。如:
(1) 对于以连词that引导的主语从句,通常用形式主语代主语从句。如:
Its a pity that he didnt come. 很遗憾他没来。
(2) 对于以连接代词(副词)引导的主语从句,可以使用形式主语代主语从句,也可直接在句首使用主语从句。如:
Whether they would support us was a problem. 他们是否会支持我们还是一个问题。
It was a problem whether they would support us. 他们是否会支持我们还是一个问题。
(3) 对关系代词型what引导的主语从句,通常不用形式主语,总是主语从句放在句首。如:
What we need is money. 我们需要的是钱。
What I want to know is this. 我想知道的就是这一点。
(4) 如果句子是疑问句,则必须用带形式主语it的结构。如:
Is it true that he is the girls father? 他是那女孩的父亲,是真的吗?
How is it that you are late again? 你怎么又迟到了?
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