1 as既可指人又可指物,在从句中作主语、动词宾语、介词宾语或主语补语,用法如下：
1.与 the same连用：
You are still the same person as I knew ten years ago.
2.与such连用
I never heard such stories as he told.
3.与so连用
Here is so difficult a problem as none of us can solve.
4.与as连用
As many people as are present have voted for the candidate.
另附：as在限定性定语从句的作用有时相当于关系副词.
Meet me at the same place as you did yesterday.