文档介绍：
It is reported that…
据报道…
It has been proved that…
已证明…
It is said that…
据说…
： （1）if 引导的主语从句不行居于复合句句首。
（2）It is said /reported…结构中的主语从句不行提前。例如：
正确表达：It is said that President Jiang will visit our school next week.
错误表达：That President Jiang will visit our school next week is said.
（3）It happens/occurs…结构中的主语从句不行提前。例如：
正确表达：It occurred to him that he failed in the examination.
错误表达：That he failed in the examination occurred to him. （4）It doesn’t matter how/whether …结构中的主语从句不行提前。例如：
正确表达：It doesn’t matter whether he is wrong or not.
错误表达：Whether he is wrong or not doesn’t matter. （5）含主语从句的复合句是疑问句时，主语从句不行提前。例如：
正确表达：Is it likely that it will rain in the evening?
错误表达：Is that will rain in the evening likely?
与that 在引导主语从句时的区分
what 引导主语从句时在句时在从句中充当句子成分，如主语．宾语．表语，而that 则不然。例如：
a) What you said yesterday is right.
b) That she is still alive is a consolation
二．宾语从句
宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词 (及物动词) 或介词之后。
(1) 由that引导的宾语从句(that 通常可以省略), 例如：
I heard that be joined the 。
(2) 由what, whether (if) 引导的宾语从句，例如：
a) She did not know what had 。
b) I wonder whether you can change this note for 。
(3) 动词＋间接宾语＋宾语从句。例如：
She told me that she would accept my 。
，例如：
Our succe depends upon how well we can cooperate with one another