as to 的功能類似於 with regard to,regarding,on the matter of,concerning 等,常用於相當正式的語境中,尤其用於爭論和做出決定時.可放於句首或與 wh- 疑問詞引導的動詞不定式和名詞性從句連用（有時可省略）,而 as for 無此種用法.例如：
As to the journey,we must decide about that later.
至於旅行,我們必須以後再作決定.
As to the flood,I have heard nothing.
至於那次水災,我沒聽到什麼.
Nobody could decide （ as to ） what to do.
誰也不能決定該做些什麼.
He is very uncertain as to whether it"s the right job for him.
關於他究竟是否適合做這項工作,他實在拿不準.
A question arose as to who should be the monitor.
關於誰當班長的問題出現了矛盾.
I want to find out as to whom this bicycle belongs to.
我要打聽出來這輛腳踏車是誰的.
as to 有時用於表示 according to 的含義.例如：
They sorted the eggs as to size and color.
他們按照大小和顏色將雞蛋進行分類.
as to 的功能類似於 with regard to,regarding,on the matter of,concerning 等,常用於相當正式的語境中,尤其用於爭論和做出決定時.可放於句首或與 wh- 疑問詞引導的動詞不定式和名詞性從句連用（有時可省略）,而 as for 無此種用法.例如：
As to the journey,we must decide about that later.
至於旅行,我們必須以後再作決定.
As to the flood,I have heard nothing.
至於那次水災,我沒聽到什麼.
Nobody could decide （ as to ） what to do.
誰也不能決定該做些什麼.
He is very uncertain as to whether it"s the right job for him.
關於他究竟是否適合做這項工作,他實在拿不準.
A question arose as to who should be the monitor.
關於誰當班長的問題出現了矛盾.
I want to find out as to whom this bicycle belongs to.
我要打聽出來這輛腳踏車是誰的.
as to 有時用於表示 according to 的含義.例如：
They sorted the eggs as to size and color.
他們按照大小和顏色將雞蛋進行分類.