It代替从句作形式主语的常见句型
一、 it 代替连词 that 引导的从句作形式主语
1. It+be+过去分词+that 从句。如：
It’s said that Tom has come back from abroad.
据说汤姆已经从国外回来了。
It was reported that more than ten children had died in the accident.
据报道有十多个孩子在这起事故中遇难了。
可用于该句型的过去分词还有：known, thought, told, believed, hoped, announced, expected, decided , suggested等，该句型常可以转换成含有宾语从句的复合句或者含有不定式作主语补语的简单句。
