It is known to us how he became a writer.这句主语从句,那部分是主句,那部分是从句?怎样分辨?从哪里可以判断是主语从句?很抱歉没有悬赏分,恳求高人帮忙!什么情况下复合句用形式主语。

As is known to us.和It is known to us.后面接什么啊?为啥 It Is known to us 和as is known to us 有什么区别 it is well known to us that是什么意思 it is known to us all,as is known to us all和what is known to us all有什么区别 有关as is known to us all,it is known to us all 的辨析1.As is known to us all,the earth is round.2.It is known to us all that the earthe is round.3.what is known to us all is that the whale is not fish but mammal.请问这3个分别是什么从 It is known to us all_ _ _ _ _there is harm.哪儿有污染 It is known to us that ______（贡献)to the development of computers in our country it known to all还是it is known to all 众所周知,成功源自努力 英语翻译It is known to us all that ___you success. it is known to us all that ……是什么句型? it is known to us all that light.=lt is___ ____that light... 单句改错 It is known to us that reading books widen our knowledge哪里错了? it is known to us用在句首时一定要跟that吗?加逗号行不行? ----is well known to us all that Taiwan belongs to China.--- is known to us all ,Taiwan is part of--is known to us all that Taiwan is part of china---is known to us all is that Taiwan is part of chinaA.it B.As C.That D.what四题应选什么,为什 It's known to us that practice makes perfect.与As is known to us,practice makes perfect!这两个句型到底有何区别? 是as is known to...还是as iT known to... ( ) they have won the game is known to us.( ) is known to us is ( ) they have won the game.( ) is known to us,they have won the game.( ) is known to us ( ) they have won the game.A.It B.That/that C.What D.As It is known to us ___ where is pollution there is harm.A.whichB.whereC.whatD.that