麻烦讲一下as在这几个句子的从句里做什么成分

题目

麻烦讲一下as在这几个句子的从句里做什么成分
You can wait for me at the same place as we did.
He is no longer the same boy as he used to be.
He is such a clever boy as every teacher likes.
I have never seen so clever a boy as he (is).

答案

You can wait for me at the same place as we did.as是引导词,引导定语从句He is no longer the same boy as he used to be.as是引导词,引导定语从句,as代表boy,he used to be boyas作表语He is such a clever boy ...