Question

it is well-known to us that...中to us做什么成分？？？英语中有没有表语补足语？？？

it is well-known to us that...中to us做什么成分？？？英语中有没有表语补足语？？？

Answer 1

it is well-known to us that...意为：总所周知的是：...

该句中to us做的就是表语补足语。
句子结构分析如下:

it is well-known to us that...中it为主语，is为系动词，well-known为表语，而to us则做表语补足语。去掉to us 后句子变为：it is well-known that...意为：知道that之后所跟的东西的人很多（它被广泛的了解、知道）。it只是一个形式主语，真正的主语是that之后所跟的句子。例如：It is well known to us that time is elapsing.意为：我们都知道：时间正在一分一秒的过去(时间正在流逝)。它原本的顺序是：Time is elapsing is well known to us.这是一个普普通通的陈述句，没有什么新意，用it做形式主语的句子显得更有含金量，考试用这样的句子更易得高分。

Answer 2

to us是表语补足语，英语有表语补足语啊