as作關(guān)系代詞,用來引導(dǎo)定語從句:限制性定語從句和限非制性定語從句，新東方泡泡少兒冬令營將其用法做出了總結(jié)。

      as作關(guān)系代詞,用來引導(dǎo)定語從句:限制性定語從句和限非制性定語從句，新東方泡泡少兒冬令營將其用法做出了總結(jié)。

    一、as引導(dǎo)限制性定語從句

    as引導(dǎo)限制性定語從句時(shí),通常和such,the same,as(so)等連用,構(gòu)成such...as/such as,the same...as/the same as,as(so)...as等結(jié)構(gòu),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(dǎo)限制性定語從句時(shí),既可指人,也可指物。such用于名詞之前時(shí),具有形容詞性質(zhì)；such單獨(dú)使用(即后面不接名詞)時(shí),具有代詞性質(zhì)。

    don’t trust such men as praise you to your face.(as作主語)

    不要相信那種當(dāng)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(yīng)當(dāng)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(jié)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(zhì)。

    we have arrived at the same conclusoin as they have.(as作賓語)

    我們已得出和他們同樣的結(jié)論。

    比較:the same...as和the same...that不同,前者是“同那一個(gè)相似”,后者是“正是那一個(gè)”。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”,后接由many,much等修飾的名詞或由形容詞修飾的單數(shù)名詞,注意其語序?yàn)閍s(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.

    很多游行的戰(zhàn)士都被殺了。

    注意:such ...as與such...that ,so...as與 so...that的區(qū)別: that是連詞,引出結(jié)果狀語從句,在從句部分不作成分;as是關(guān)系代詞,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.

    二、as引導(dǎo)非限制性定語從句

    as引導(dǎo)非限制性定語從句時(shí),通常指的不是主句中的某一個(gè)名詞(先行詞),而是指整個(gè)主句表達(dá)的內(nèi)容,對(duì)主句所作的陳述進(jìn)行附加說明,意為“這...,如...或正如...”。這種從句可位于主句之前,之中或之后。

    as we all know,taiwan belongs to china.

    taiwan,as we all know, belongs to china.

    taiwan belongs to china,as we all know.

    注意下面的習(xí)慣用法:

    as is well discussed 正如已討論過的

    as is often said 正如通常所說

    as is often the case 通常就是這樣

    as has been pointed 正如所指出的那樣

    as has been said before 如上所述

    as often happens 如同經(jīng)常所發(fā)生的那樣

    as might be expected正如所料

    as is well known to all眾所周知

    在多數(shù)情況下,從句中的謂語助動(dòng)詞可以省略

    as explained before 如前面所解釋的

    as mentioned above 如前面所提到的

    as shown in the figure 如圖所示

    as seen from the table 從表中可以看出

    as already discussed 正如已討論過的