as引导的定语从句，as做什么成分

Question

如题所述

Answer 1

as在引导定语从句时,既可以引导限制性定语从句,也可以引导非限制性定语重句.在两种情况下都可以分别充当主语,宾语和表语.
1）非限制性定语从句做主语：As is known commenly, grammer is over valued in education. 【众所周知,在教育中语法的重要性被过分强调了】
2）非限制性定语从句做宾语：As you know, you get only confusion from endless grammer rules. 【 你也知道,你从无尽的语法中只能得到更多的困惑】
3）非限制性定语从句做表语：As it actually is, grammer makes no sence to natives. 【实际上,对于英语是母语的人来讲,语法就是无稽之谈】
4）限制性定语从句做主语：You learn it as is required in the exam syllabus. 【因为考试大纲的原因,必须得学习语法】
5) 限制性定语从句做宾语：You never understand the diferences as they tell. 【但难以理解他们所讲的这些语法差异在哪儿里】
6）限制性定语从句做表语：You even feel like the same as never learnt these grammers.【甚至觉得语法完全往无头绪】
so, trust me, read as much as you can, remember as much as you read, forget these bullshits i wrote above, and you will improve all the way as you wished.

Answer 2

as引导定语从句，其含义相当于that/which/who/whom.在定语从句中主语，宾语或表语。