which 在定語從句中的用法

　　總結(jié)：

　　( 1 ) Which 指前面主句所提到的這件事，常譯為“這件事，這一點(diǎn)”等; as 具有“正如、像、由„„而知、與„„一致”的意思。

　　He was elected mayor of the city, which made us happy.

　　他被選為這個(gè)市的市長，這使我們很高興。

　　As we expected, he didn't appear at the party.

　　正如我們所預(yù)料，他沒有在聚會(huì)上出現(xiàn)。

　　( 2 ) Which 在句法上一般用作實(shí)義動(dòng)詞的主語，這時(shí)它所引導(dǎo)的從句與主句之間常含有并列、因果關(guān)系;句法上， as 常作一些實(shí)義動(dòng)詞(如 see, know, report, watch, remember, say, tell, show, expert, guess 等)的賓語。

　　I bought my sister a big toy, which ( = and that ) delighted her greatly.

　　我給妹妹買了一個(gè)大玩具，這使她非常高興。

　　As is known to everybody, the moon travels round the earth once every month.

　　眾所周知，月球每個(gè)月環(huán)繞地球運(yùn)行一次。

　　( 3 ) which 引導(dǎo)的非限定性定語從句位置比較固定，通常位于句末，不可移至句首;而 as 所引導(dǎo)的非限定性定語從句的位置比較靈活，可以位于句末，也可以位于句首或句中。

　　Taiwan is a beautiful island, as (= which ) we know.

　　正如我們所知，臺(tái)灣是一個(gè)美麗的島嶼。

　　As (不用 Which ) he realized, I was very useful to him.

　　他意識(shí)到我對(duì)他很有用。

　　Mary, as we had expected, passed the exam.

　　正如我們所預(yù)料， Mary 通過了考試。

　　( 4 )當(dāng)從句的謂語動(dòng)詞是否定形式或從句謂語動(dòng)詞接了一個(gè)復(fù)合賓語結(jié)構(gòu)時(shí)，一般用 which 而不用 as 。

　　He pretended not to know me, which I didn't understand. 他假裝不認(rèn)識(shí)我，我真不明白為什么。

　　He admires everyone in the class, which I find quite strange. 他羨慕班里的每個(gè)學(xué)生，我覺得很奇怪。

　　( 5 )不能省去非限定性定語從句中的 be 動(dòng)詞時(shí)，用 which (反之則用 as )。

　　Jane told me she won the match, which was a lie.

　　簡告訴我她贏得了比賽，這是謊話。( was 不可省略) As (was)planned, we met at the airport. 正如計(jì)劃那樣，我們在飛機(jī)場見面了。( was 可省略)