“It be done that...” 是一种常见的英语被动句型，其中 “it” 为形式主语，真正的主语是后面的 that 从句。
基本结构为：
It + be + 过去分词（done）+ that + 主语 + 动词...
常见动词包括：said, believed, known, reported, thought, suggested, decided 等。
It is said that he has gone abroad.
→ 据说他已经出国了。
It was believed that the earth was flat.
→ 人们曾认为地球是平的。
It has been decided that the meeting will be postponed.
→ 已经决定会议将延期。
It is known that water boils at 100°C.
→ 众所周知，水在100°C沸腾。
该句型常可转换为主动语态，例如：
It is said that he is rich.It is believed that the planet exists.这种转换使语气更客观、正式，常用于学术写作或新闻报道中。