what is konwn 可以引导主语从句,what在从句中当主语,主动语态实际上是know的宾语
What is known to us is that the earth goes round the sun.
我们大家都知道的是地球绕太阳转.
it is konwn( that)据说 ; 众所周知 that引导主语从句
It is known that the fire will be put down soon.
据说大火将会很快被扑灭。
It is known that Shanxi has rich coal reserves.
据了解山西省有丰富的煤炭资源。
it is known to all that众所周知 that引导主语从句
It is known to us all that he is good at English.
众所周知,他擅长英语。
It is known that Ta iwan belongs to China.
众所周知台湾是中国的。
as is know to us all 众所周知 引导非限定性定语从句,
As it is known to us, the moon goes around the earth.
众所周知,月亮绕着地球转。
it is know for sth 因...而闻名
It is known for its handicraft products.
这地方因出产手工艺品而闻名。
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