主語從句和形式主語的區別

主語從句定義：在句子中擔當主語的是一個從句，這個從句就叫做主語從句。

主語從句是在複合句中充當主語的從句，通常放在主句謂語動詞之前或由形式主語it代替，而本身放在句子末尾。

It 作形式主語和it引導強調句的區別

①主語從句常用it作形式主語，一般常用句型為：It is+{名詞/形容詞/過去分詞}+主語從句

例如：

It is still a question whether she will come or not.

It is strange that you should like him.

It is still unknown which team will win the match.

另外，還有一些比較多見的結構：

It turned out that……

It has been proved that……

It happened/occurred that……

It is well-known that……等等

②而強調句則不同，它的結構是：It+be+被強調部分+that+從句

強調主語：It is the times that produce their heroes.時勢造英雄

強調賓語：It is English that teaches us.

強調狀語：It was in shanghai that I saw the film.