as is known what is known it is known这三个有什么区别 最好把例子举出来!

问题描述:

as is known what is known it is known这三个有什么区别 最好把例子举出来!
都是什么从句的呢

As is known是定语从句,as可以指代后面被修饰的主句.eg.As is known to all,Beijing is the capital of China.(众所周知,北京是中国的首都)What is known是引导宾语从句的,用what来指代.eg.What is known is that ...