As (is) known to all.请问这个句式放句首时is可以省略不写吗？

Question

好像记得as引导非限制性定语从句时后面的be动词可以省略?

Answer 1

这个可以有。
这里as 是连词。这是带连词的过去分词短语作状语，相当于一个状语从句，等于As it is known to all.
而as is known to all是非限制性定语从句。此时as是关系代词代替后面句子所表达的内容。
二者意思一样，但句子结构不一样。
再如
As known to all, jurisdiction is the last way to guard social justice.
众所周知，司法是捍卫社会正义的最后一道防线。

Answer 2

它和 as is known to all 是相同的意思,都是“众所周知”,而用法上面略有些不同,as is known to all 只可以用在句首或句尾,用“,”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.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.本回答被网友采纳

Answer 3

不可以省略。追答

As 是关系代词，代替后面的一句话，在定语从句中作主语，is known 是被动语态谓语。汉语意思：正如大家所知道的⋯

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所以说As引导的非限制性定语从句无论放在句首还是句尾句子的be动词都不能省略是吗？

追答

是的。

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