as在引导定语从句时相当于代词，一般作主语，而引导状语从句时可是为连词，表原因、让步等等。下面是小编整理的as定语从句状语从句，欢迎大家阅读参考。
AS在定语从句中的.用法
意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。例如：
我们要尽量少犯错误
should make a few mistakes.
should avoid mistakes.
should make (as) a few mistakes.
4.(as) we should (avoid mistakes)
should make as a few mistakes as we should.
我们要尽量多吃蔬菜
should eat much vegetable food.
should eat the food.
should eat (as ) vegetable food.
4.(as) we should (eat the food).
should eat as vegetable food as we should.
the same~~as~~
他不再是我认识的那个花花公子。
is not the playboy.
2.i know the boy years ago.
is not the (same) playboy.
3.(as) I know (the boy) years ago.
is not the same playboy as i know.
as引导让步状语从句
结构： n./ v.原型 / adj. / adv. + as + 其他
1. adv. 提前：
Although he failed in doing his experiment again, he didn’t lose heart.
Again as he failed in doing his experiment, he didn’t lose heart.
2. adj. 提前：
Although the necklace was beautiful, we thought it was over-priced.
Beautiful as the necklace was, we thought it was over-priced.
3. n. 提前：
Although she is a child, she is knowledgeable.
Child as she is, she is knowledgeable.
单数可数名词前一般不带冠词
4. v. 提前：
Although I failed, I would never stop trying.
Fail as I did, I would never stop trying.
Try as I may, I could never explain what I hear when you don’t say a thing.
Although we may dislike him, we have to acknowledge his greatness.
Dislike him as we may, we have to acknowledge his greatness.
动宾短语同时提前
