756　是强调结构还是主语从句结构

◎ 由it作形式主语的从句结构，辨别的方法是：如果将It is/was…that这一句结构去掉，句子仍然成立，就是强调结构，如果句子不能成立，就是由that引导的主语从句结构。比较：

It is the committee's decision that has been carried out. 被执行的是委员会的决定。（为强调结构）

The committee's decision has been carried out.

It is the committee's decision that he will be in charge of the work. 由他负责这项工作是委员会的决定。（为主语从句结构，it为形式主语，代替that引导的主语从句）

He will be in charge of the work is the committee's decision.