as的用法
AS作關係代詞,用來引導定語從句:限制性定語從句和限非制性定語從句 一、AS引導限制性定語從句
AS引導限制性定語從句時,通常和such, the same, as(so)等連用,構成such...as/such as, the same...as/the same as, as(so)...as等結構,在從句中可作主語,賓語和表語。
1.such...as/such as意為―...的那種...,像那樣的‖,such...as/such as引導限制性定語從句時,既可指人,也可指物。such用於名詞之前時,具有形容詞性質;such單獨使用(即後面不接名詞)時,具有代詞性質。
Don『t trust such men as praise you to your face.(as作主語) 不要相信那種當面吹捧你的人。
You should read only such books as you can understand without much difficulty.(as作賓語) 你應當只讀那些你讀起來不太難懂的書。
Associate with such as will improve your manners.(as作主語) 要和能改善你的言行的那種人結交。
2.the same...as/the same as意為―與...同樣的‖,和such一樣,the same既有形容詞作用,又有代詞性質。
We have arrived at the same conclusion as they have.(as作賓語) 我們已得出和他們同樣的結論。
比較:the same...as和the same...that不同,前者是―同那一個相似‖,後者是―正是那一個‖。如:
This is the same watch as I lost. 這同我丟的那塊表一樣。
This is the same watch that I lost 這正是我丟的那塊表。
3.as(so)...as意為―和...一樣‖,後接由many, much等修飾的名詞或由形容詞修飾的單數名詞,注意其語序為as(so)+adj.+a+n+as,如: It『s as pleasant a film as I have ever seen. 這是一部和我以往看的同樣好的電影。
As many soldiers as marched were killed. 很多遊行的戰士都被殺了。
注意:such ...as與such...that ,so...as與 so...that的區別: that是連詞,引出結果狀語從句,在從句部分不作成分;as是關係代詞,引出定語從句,在從句中可作主語,賓語和表語。比較: He is such a nice boy that everyone likes him. He is such a nice boy as everyone likes.
It is so difficult a problem that nobody can work it out. It is so difficult a problem as nobody can workout.
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