as在定語從句中是什么意思？怎么用？as定語從句例句有哪些呢？

　　定語從句as造句的句子

　　(1) As is known to all, China is a developing country.

　　(2) He is from the south, as we can see from his accent.

　　(3) John, as you know, is a famous writer.

　　(4) As a student，I am supposed to work hard.

　　定語從句中as的用法

　　引導狀語從句的連詞as可以用作關系代詞，引導定語從句，因而被稱作準關系代詞。

　　1.準關系代詞as引導限制定語從句，用于以下3個結構中，as在從句中作主語、賓語或表語：

　　a.so / such…as

　　Such people as were mentioned by him were honest. (as作主語)

　　I’ve never seen such a clever man as he is. (as作表語)

　　Last term our maths teacher set so difficult an (= such a difficult) examination problem as none of us worked out.

　　b.the same…as

　　Modern statemen are often faced with the same problem as defeated the ancient Romans. (as 作賓語)

　　I like the same book as you do. (as 作賓語)

　　c.as…as

　　As many children as came were given some cakes. (as 作主語)

　　He is as diligent a man as ever lived. (as 作主語)

　補充：

　　a.such…as 與 such…that的區別

　　such…as 引導定語從句；such…that引導結果狀語從句。

　　They talked in such simple English as children could understand.

　　他們用孩子們能聽懂的簡單的英語交談。

　　They talked in such simple English that children could understand it.

　　他們用十分簡單的英語交談，連孩子們都能聽懂。

　　I will provide you with such things as you may need.

　　我要供給你一些你可以用得著的東西。

　　He shut the window with such a force that the glass broke.

　　他如此用力地關門，結果玻璃碎了。