as to, as for

as for sth 至於(通常放句首轉換主題
as for 5w1h 至於
as to sth 至於之前(與 as for 不同的是,這個字接對話中有提到的事情
as to 5w1h 關於(另外一個用法是接 5w1h,as for 就不能這麼用
as to 5w1h 關於( 另外一個用法是接 5w1h,as for 就不能這麼用