as, though, although引导的让步状语从句。
[注意]although位于句首；though位于句首或句中；as位于句中=though=that。它的词序是把句中强调的形容词、副词、动词或名词放在连词前。[参考倒装结构] 请注意下列句式的变化：
[例句]
1. Although/Though I’m young, I already know what career I want to follow.
→Young as/though/that I am, I already know what career I want to follow.
