1.原因状语从句
As it is raining ,we shall not go to the park.
2.时间状语从句
As he grew older,he began to go deaf.
3.让步状语从句
Child as he is,he knows a lot.
4.方式状语从句
The professor told the students to do as he did.
5.比较状语从句
My room is as big as yours.
as能引导哪几种状语从句,在举个例句说明下~