as限定性定語從句

引導狀語從句的連詞as可以用作關係代詞,引導定語從句,因而被稱作準關係代詞.

1.準關係代詞as引導限制定語從句,用於以下3個結構中,as在從句中作主語、賓語或表語：

/ 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.

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)

…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：

…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.

same…as與the same…that的區別：

the same…as指兩物相似,the same..描述的是同一物.

This is the same bag as I lost yesterday.

這個書包和我昨天丟失的（書包）相似.（相似物）

This is the same bag that I lost yesterday.

這正是我昨天丟失的那個書包.（同一物）