as is vividly indicated in the above chart,a young guy is sitting on the ……

题目

as is vividly indicated in the above chart,a young guy is sitting on the ……
as is vividly indicated in the above chart,这句话怎么理解其结构?总感觉as is 怪怪的~还原就对了么?我总感觉as it顺~可貌似语法不对~求教~
是对句子不是很明白~

答案

AS引导了非限制定于从句（和WHICH一样,但WHICH只能用在句中）
也就是说,AS后面句子的主语其实就是逗号之后的句子
所以你看不到IT
还原的话就是
a young guy is sitting on the ……,as is vividly indicated in the above chart.
或者可以这样
that a young guy is sitting on the ……is vividly indicated in the above chart.
其中that可以是句子名词化,这样就可以做主语了,不然一个句子是无法做主语的,也就是为什么你那句话里用了AS的原因了～～