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.
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着的東西.
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）
學識谷
