it is known to us all,as is known to us all和what is known to us all有什么区别

as is known to us all是由as引导的定语从句, as指代后面或前面的整个主句,因此as is known to us all结构可放句首,也可放句中或句末,但一定要用逗号与主句隔开.what is known to us all是一个名词性从句,常用来作主语从句,用于这个结构中:What is known to us all is that.

例如: It is known to us all that he will visit our school tomorrow . =As is known to us all , he will visit our school tomorrow . =What is known to us all is that he will visit our school tomorrow .As is known to us all, the earth goes round the sun!=It is known to us all that the earth goes round the sun!=What is known to us all is that the earth goes round the sun!It is known to us all when the meeting will be held . It is known to us all where the meeting will be held . It is known to us all why you didn't come to school yesterday.