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As引导的定语从句

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        1. as在限制性定语从句中的应用

 

    As 用作关系代词或关系副词引导限制定语从句时,主要用在 “such (+ n.) + as …”(和…同样的),“the same (+ n.) + as …”(像…这样的,像…这/那的),“the same as”(同样的人、事),“such as”(这样的东西或人)等结构中,as在从句中可以作主语、宾语、表语和状语。

结构

  

the same (+ n.) + as …

We do the same work as they (do). 我们和他们干同样的活。

We go the same way as they do. 我们和他们走的是同一条路。

He is reading the same book as I did yesterday. 他正在读的书和我昨天读的书一样。   

the same …that…

He is reading the same book that I read yesterday.

他正在读我昨天读的那本书。

such (+ n.) + as …

 

such as…

Such people as knew Mary admired her. 认识玛丽的人都钦佩她。

He is not such a fool as he looks. 他并不像他看起来那样傻。

I haven’t much money but you can use such as I have.

我并没多少钱,但你可以用我手头的这些。

Such of us as knew him will regret his death.

我们所有了解他的人都会哀悼他的去世。

as…as

He smokes as expensive a cigarette as he can afford.

他抽一种他买得起的最贵的香烟。

 

        2. aswhich引导的非限制性定语从句中的区别

as从句

which从句

1. as只指代整个主句。

2. 引导从句时表示“正如”,没有具体的内容。

3. 从句的位置很灵活。

   Air, as is well-known, is a gas.

   众所周知,空气是气体。

The night has turned cold, as is usual around here.

夜晚变得冷,在这一带通常如此。

   Water is boiling at 100ºC, as is shown in the figure.   如图所示,水在100ºC时沸腾。

1. which 既可指代整个主句又可指代主句中的一部分。

2. 引导从句时表示具体的内容。

3. 从句只能放在主句之后。

   He changed his mind at the last moment, which made me angry.

   他在最后一刻改变了主意,这是我很生气。

I called him by the wrong name, for which mistake I apologize.

   我叫错了他的名字,对此我表示道歉。

        3. as引导的非限制性定语从句常常成为一些惯用句型:

       as was discussed before 如前所述

       as is reported / announced in today’s papers 据今天的报纸报道

       as is / has been pointed out 正如所指出的那样

       as is shown in the figure 如图所示

       as has / had been said before 如前所说

       as may be imagined  正如可以设想的那样

       as is well-known  众所周知

       as we all can see 正如我们有目共睹

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