as is known to all语法 as is known to all的语法

as is known to all语法 as is known to all的语法,

as is known to all的意思为众所周知的事。as在这里作关系代词，引导非限制性定语从句，指代主句内容。其引导从句既可以放句首的位置，也可以放句末。当as指代主句所讲述的内容时，也做关系代词。需要注意的是，as在作关系代词时，极易被误认为是连接词而加用it。

三、关系代词which在非限制性定语从句，中所指代和修饰的可以是主句中的名词、形容词、短语、其他从句或整个主句，在从句中作主语、动词宾语、介词宾语或表语。