隔开。而as it is known to all不仅可以放在句首，还可以后面加“that”从句。
As is known to us是AS引导的非限制性定语从句，后面加句子以","隔开.
平常的心
It is known to us IT是形式主语，后加"that+句子"
而it is known to all 是形式主语的典型，只用于如it is known to all that our teacher is beauful.
谢谢参考哦~希望可以帮到你，都是正确的答案~
句子
1。As is known to us all, the earth is round. 定从
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. 主从
As is known to us all在句子中充当状语，是对句子的修饰成份it's known to us all
是句子主干的一种普遍形式，后面加that接从句，it实为从句部分的代词，避免了
句子的头重脚轻。
三个句子，头两句意思是一样的，说法稍微不同而已，第一句译为“众所周知，地球
是圆的”第二句“地球是圆的是我们都知道的。第三句中，由What引导的从句作主语，That后面的从句作宾语，是一种稍微复杂的表达方式，实际意思相差无几，逐字译
为“我们都知道的事是‘鲸鱼不是鱼是哺乳动物’这件事。”
1. ( ) that the earth is round.明矾化学式
A. As is known to all
B. As you e
油麦菜孕妇能吃吗
C. It is known to all
D. As is en
A B C D的区别？
发明的近义词
2. Whether ways will be found to stop pollution or not is just (
) worries the public.
A, why B. which
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C. that
D. what
并翻译一下这句．
辞职信30字
原因状语从句一般由becau, since, as, for引导。注意as,becau,since和for的区别:
土炮锦鲤 ①如果原因是构成句子的最主要部分，一般用becau。becau引导的从句一般不放在句子的开头。例如:
I misd the train becau I got up late.
注：对于以why开头的问句，一般只能用becau引导的从句来回答。
②如果原因已为人们所知，或不如句子的其余部分重要，就用as或since、since 比as稍微正式一些。as和since引导的从句一般放在句子的开头。例如:
