并不是所有although引导的让步状语从句都可以转化为as 引导的让步状语从句
as 引导让步状语从句的情况：
1) 主+系+ 表（形容词、名词）
表（adj）+ as + 主+系 Young as he is,he knows a lot.
表（n ）+ as + 主+系 Child as he is,he knows a lot.(名词前不能加冠词)
2)主+ 谓+ （宾）+状语
状语+ as +主+ 谓+ （宾）Many times as he failed the experients,he never lost courage.
Early as he got up,he couldn't catch the early train.
3).主+ 情态动词+动词原形
动词原形+ as + 主+ 情态动词 Try as he might,he couldn't open the door.
不符合上述情况的不能用as 引导让步状语从句.