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(6)  當關系代詞代替主句中的賓語從句或復合結構(如：賓+補；不定式短語；動詞-ing形式短語等) 時，一般只能用which, 而不用 as。如：

She told us that there was something wrong with her bike, which was true。她告訴我們說她的單車出了毛病，這話是真的。

He asked her to help him with his English, which she did. 他請她教他學英語，她的確幫了。

(7)  關系代詞僅代表主句中的謂語部分時，從句中謂語部分被省略而只保留情態動詞的否定式或助動詞否定式，引導詞一般只用which, 而不用as。如：

He speaks English very fluently, which I can’t. 他的英語說得非常流利，這我可不行。

(8) 關系代詞作定語修飾后面的名詞時，一般只用which, 而不用as。如：

He suggested going swimming in the river, which idea we agreed with. 他提議去河里游泳，我們就同意了他的想法。

(9) 當關系代詞僅代表主句中單個的名詞時，一般只用which, 而不用as。如：

He sent me a beautiful present, which I valued very much. 他給寄來了一件精美的禮物，我對它非常珍視。

(10) as 在非限制性定語從句中，還常跟such連用。如：

There was a look of love in the teacher’s eyes, such as mothers have for their children. 老師眼里流露出對他喜愛的神情，就好像母親對孩子的喜愛。

(11) as常用于一些固定結構中。如：

as is well known / as we all know 眾所周知；             as is said above 正如上面所說；

as might be imagined 正像所想象的那樣；                  as is reported 如報道所說；

as has been pointed 如所指出的那樣；                        as is expected 正如所料。

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