as_在定语从句中用法

I use the same textbook as you do.
= I use the textbook just like the one that you do. the same …as 和…一样的
I stay in this classroom. You all stay in this classroom too.
Simon accepted as much advice as Mr Yang gave to him. as…as… 像….一样…..
总结 非限制性定语从句 应注意以下几点：
一、非限制性定语从句通常不能用that 引导。 1. I like the book, which was bought yesterday. 我喜欢这本书，这是昨天买的。 2. I like the book which/that was bought yesterday. 我喜欢昨天买的那本书。
五、which可指前面整个句子。 The sun sends out light and heat, which makes it possible for living things to exist on the earth. 太阳发出光和热，这使得生物能够在地球 上生存。 which可代替句子, 用于非限制性定语从 句。that不能用于非限制性定语从句。
as和which的差别
• as 引导的从句位置灵活，多放句首，并有 逗号隔开， which一般多放主句后面（见报 纸）
as 用在固定结构中 如：the same…as… such…as… as…as… so…as…
像…一样的
I use the textbook.
You use the same kind of text book, too.
I stay in the same classroom as you all do.
她和我坐在同一排。
这是一本年轻人都喜欢的书。
This is such a book as all young people like. 这是一本如此有趣的书以至于年轻人都喜欢。
This is such an interesting book that all young people like it.
Leabharlann Baidu
四、在非限制性定语从句中，指人的关 系代词作宾语时，只能用宾格whom; 不能用who替换，也不能省略。 1. Do you know Tom, whom we talked about? 你认识汤姆吗? 我们谈到过他。 2. This book, which you can get at any bookshop, will give you all the information you need. 这本书会给你提供所有你需要的资料， 它在任何一家书店都能买到。 (非限制性定语从句中引导词在从句中作
as 用在非限制性定语从句中, 有“正如…” “正像…” 之意。
As is often the case, 这是常有的事
As is known to us all，众所周知
As is said/mentioned above,
As often happens, 正如经常发生的那样 As has been pointed out 正如已指出的那样 As we all know, body language sometimes is the key to successful communication.
二、非限制性定语从句不能用why引导, 要用for which代替why。 1. I had told them the reason, for which I didn't attend the meeting. 我已经把理由告诉了他们，为此我没有 去开会。 2. I had told them the reason why I didn't attend the meeting. 我告诉了他们我不去开会的理由。 (限制性定语从句“the reason why ...”是 常见搭配。)
There is so warm a house as we want to live in. 这里有如此暖的房子，我们都想住在里面。
so…as… 如此的…
他有如此难的一个问题，我们没有人能解决。
He has so difficult a problem, as none of us can solve.
三、非限制性定语从句置于句首时，不 能用which引导。关系代词as引导非 限制性定语从句位置比较灵活，可以 放主句前，也可以放主句后。 1. As I expected, he didn't believe me. 正如我所预料的，他不相信我。 2. She heard a terrible noise, which brought her heart into her mouth. 她听到一个可怕的声音，这让她把心都 提到嗓子眼了。