Question

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

Answer 1

这三种结构的相同点: 意思相同,都表示"众所周知/我们大家都知道"
不同点:用法各不相同.

It is known to us all中的It为形式宾语,因此这种结构后必须接一个主语从句来作真正的主语.
这个主语从句可以是that或wh-类连词引导的从句.即:
It is known to us all+that/what/when/where/how从句.

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.

Answer 2

1. It is known to us all 后面接 that 引导的主语从句，it 在句子中只是形式主语而已。
It is known to us all that the earth is round.
众所周知，地球是圆的。

2. as is known to us all 往往引导一个非限制性定语从句，可放在句首，也可放在句末。
As is known to us all, the earth is round.
众所周知，地球是圆的。

3. what is known to us all 引导一个名词性从句。
What is known to us all is that the whale is not fish but mammal.
众所周知，鲸鱼不是鱼而是哺乳动物。

希望能帮助你！真心祝你学习进步、天天开心！

Answer 3

三者可以相互转换，喔不过，那个what is known to us all转换时应写成what is known to us all is that…令外，as we all know也可以和它们相互转换

Answer 4

这是我们都知道的......强调 “这” 内容应该是我们都知道的
正如我们所知道的......强调我们已经都知道了之后
就是我们所知道的......强调 “这” 就是我们所知道的