【高一英语】为什么(Judging)from his accent.而不是用Judge、Judged、if Judging.

问题描述:

【高一英语】为什么(Judging)from his accent.而不是用Judge、Judged、if Judging.
RT.

这是固定用法,Judging by/from sth,你记住就行了,不必深究.是不是现在分词作状语。?这应该是属于独立结构,在句中也相当于状语了。