(4) It is＋过去分词＋从句

It is reported that... 据报道...

It has been proved that... 已证实...

It is said that... 据说...

it 作形式主语和it引导强调句的比较

it 作形式主语代替主语从句,主要是为了平衡句子结构, 主语从句的连接词有变化。而it引导的强调句则是对句子某一部分进行强调,无论强调的是什么成分, 都可用连词that。被强调部分指人是也可用who/whom。例如:

判断:

It is a pity that you didn't go to see the film.

It doesn't interest me whether you succeed or not.

It is in the morning that the murder took place.

It is John that broke the window

宾语从句的用法：

句子结构：

主句 + 连接词(引导词) + 宾语从句

连接词: 从属连词that, whether, if

连接代词: Who, whom, whose, which, what

连接副词: where, how, why, when

一. 连词 (引导词)

1. 当宾语从句是陈述句时(包括肯定句和否定句), 连词由that引导, 因为that在从句中不作任何成分, 也没有任何具体意思, 因此在口语或非正式文体中常省略。

Jane said (that) she wasn't late for the meeting.

2. 当宾语从句是特殊疑问句时, 由特殊疑问词充当连接词, 因为该特殊疑问词(即连接词)在从句中担任一定的句子成分, 具有一定的意义, 所以不可以省略。

Do you know what he said just now?

I don't remember when we arrived