题目

先行词和形式主语的区别（it)
It is quite clear that the whole project is doomed to failure.
It's a pity that you should have to leave.这两句话It 做先行词.
It is necessary that…或It is a fact that… 中的It 是做形式主语,请问他们之间的区别.感激不尽

提问时间：2021-03-01

答案

It is quite clear that the whole project is doomed to failure.
It's a pity that you should have to leave这两句话的it就是形式主语啊,根本就不是先行词
你看看句子就知道了,你是不是认为it后面跟了句子就是定语从句,it就是先行词?那你就错了,这不是定语从句,而是主语从句.之所以要用it来作形式主语,是因为一个句子来作主语会有“头重脚轻”的感觉,其实这就是英语为什么会有形式主语的原因.
先行词和形式主语是不可比的.