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(6)  當(dāng)關(guān)系代詞代替主句中的賓語(yǔ)從句或復(fù)合結(jié)構(gòu)(如：賓+補(bǔ)；不定式短語(yǔ)；動(dòng)詞-ing形式短語(yǔ)等) 時(shí)，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(shuō)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(qǐng)她教他學(xué)英語(yǔ)，她的確幫了。

(7)  關(guān)系代詞僅代表主句中的謂語(yǔ)部分時(shí)，從句中謂語(yǔ)部分被省略而只保留情態(tài)動(dòng)詞的否定式或助動(dòng)詞否定式，引導(dǎo)詞一般只用which, 而不用as。如：

He speaks English very fluently, which I can’t. 他的英語(yǔ)說(shuō)得非常流利，這我可不行。

(8) 關(guān)系代詞作定語(yǔ)修飾后面的名詞時(shí)，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(dāng)關(guān)系代詞僅代表主句中單個(gè)的名詞時(shí)，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(lái)了一件精美的禮物，我對(duì)它非常珍視。

(10) as 在非限制性定語(yǔ)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(duì)他喜愛的神情，就好像母親對(duì)孩子的喜愛。

(11) as常用于一些固定結(jié)構(gòu)中。如：

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

as might be imagined 正像所想象的那樣；                  as is reported 如報(bào)道所說(shuō)；

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

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