下面是小編整理的定語從句關係代詞as，歡迎閱讀。
as引導限制性定語從句
例題：I had never heard such an interesting story ______ you told me yesterday.
A. thatB. whichC. asD. that/which
有些同學可能選擇D，這說明有關定語從句的基本知識學得不錯，但知識還是有漏洞。
要記住：
如果先行詞被such, the same, so+形容詞+a/an，as+形容詞+a/an修飾時，這時關係詞我們要用as。
此時，as同that, who, which, whom一樣，是關係代詞，代指the same, so, such和as引導的短語，常譯作“正如，像”，在定語從句中通常作主語、賓語和表語。
A. 先行詞被such修飾時，構成“such…as…”。
It’s such a heavy stone as nobody can move.
那是一塊重得沒人能移得動的石頭。(as作賓語)
Don’t trust such men as praise you to your face.
不要相信那種當面吹捧你的人。(as作主語)
B. 先行詞被the same修飾時，構成“the same…as…”。
We have arrived at the same conclusion as they have.
我們已得出和他們同樣的.結論。(as作主語)
This is the same watch as was worn by John.
這與約翰戴的那塊表一樣。(as作主語)
C. 在 “as…as…” 句型中，第一個as後面跟名詞時。
它可以看作是 “as+形容詞+as” 的一種變化形式。
He is as good as his brother. 他和他弟弟一樣好。
這句話還可以表達爲：
He is as good a boy as his brother.
It’s as pleasant a film as I have ever seen. (as作賓語)
這是一部和我以往看的同樣好的電影。
(參看P.42考點4)
D. 在“so+形+冠+n. + as”句型中 (He is so good a student as every teacher likes.)
它可以看作是先行詞被such修飾時關係代詞用as(第一種情況)的一種變化形式。
He is such a good student as every teacher likes.
他是一個每個老師都喜歡的這樣一個好學生。
用so可以表達爲：
He is so good a student as every teacher likes.
