A /as 引导让步状语从句的时候必须倒装,可以把表语或状语提前,如：Child as he is ,he knows a lot.
Young as he is,he knows a lot.
Much as he likes English,he is not good at it.
如果没有表语或状语的话,也可以把动词原形提前,这是后面往往会有情态动词或助动词may,might,will,would
Try as he might,we could not bring him around to accept our view.