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as 用法详解
作者:JDG    文章来源:本站原创    点击数:    更新时间:2010-12-19    
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as 用法详解  

   

1. 用作介词,主要表示“作为”“当作”“充当”“如同”等。如:  

He treats me as a child. 他把我当小孩看待。  

As your doctor, I advise you to eat less. 作为你的医生,我建议你少吃点。  

另外,它还可表示“当……时候”“例如”。如:  

As a child he was sent to six different schools. 他儿时前后上过6所学校。  

I was wearing clothes for dirty work, as when gardening. 我穿着做粗活的衣服,例如栽花种草时所穿的衣服。  

2. 用作连词,注意以下用法:  

(1) 表示“随着”,后接句子。如:  

As time passed, things seemed to get worse. 随着时间的推移,情况似乎变得更糟了。  

若其后不接从句,而接名词,则用介词 with 表示“随着”。如:  

With the development of modern agriculture and industry, more and more waste is produced. 随着现代工农业的发展,污染越来越严重了。  

(2) 表示让步,意为“虽然”“尽管”,要用于倒装句(相当于 though,但语气稍弱)。如:  

Boy as he was, he behaved like a girl. 他虽然是个男孩,但举止却像个女孩。  

Much as I like you, I couldn’t live with you. 我尽管很喜欢你,却不能和你一起生活。  

Try as he would [might]he couldn’t open the door. 他试过多次了,却仍打不开门。  

该用法请参见although词条。  

(3) 表示时间,意为“当……时候”。如:  

He dropped the glass as he stood up. 他站起来时,把杯子摔了。  

As I was coming here, I met your brother. 我来这里时碰到了你的弟弟。  

注意,as引导时态状语从句时,其谓语动词通常只能是动作动词,而不能是静态或状态动词。如:  

她出生后不久父母双亡,是由姑母抚养大的。  

误:Her parents died as she was a baby and she was brought up by her aunt.  

正:Her parents died when she was a baby and she was brought up by her aunt.  

但是,当as用于引导原因状语从句时,从句谓语可以是静态动词或状态动词。如:  

As you weren’t there I left a message. 因为你不在那里, 我留了个信儿。  

3. 用作关系代词,主要用法有:  

(1) 用在 such, same, as 等之后,引导限制性定语从句。如:  

I live in the same place as Tom does. 我和汤姆住在同处。  

He’s not such a fool as he looks. 他并不像看上去的那样愚蠢。  

He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。  

(2) 单独用作关系代词,引导非限制性定语从句,可放在主句之前、之后或中间,且主从句之间一般要用逗号隔开。如:  

As was expected, he succeeded at last. 正如我们所料,他终于成功了。  

I had coffee after dinner, as is my usual practice. 我饭后喝咖啡,这是我的习惯。  

Freddie, as might be expected, was attending the conference. 弗雷迪在参加会议,这是可以预料到的。  

(3) aswhich的区别(www.yygrammar.com)  

引导限制性定语从句的区别:as用作关系代词引导限制性定语从句时,它通常只用于 such, same, as 等之后,而which 用作关系代词引导限制性定语从句时,则用于除 such, same, as 之外的其他结构。  

引导非限制性定语从句的区别:which引导非限制性定语从句时,通常只能位于主句后,而as引导的非限制性定语从句位于主句之前、之后或中间。  

根据从句谓语动词的特点来看,as在定语从句中作主语时,从句谓语通常要有be或别的系动词,但which不受此限制。如:  

Li Ming was late, which (=and this) made Mr. Zhang very angry. 李明迟到了,这件事使张先生非常生气。(不可用as)  

根据句意的逻辑性来看,as引导的定语从句只表示一个众所周知或意料之中的事,但which不受此限制。如:  

He married her, as [which] was natural. 他和她结婚了,这是很自然的。  

He married her, which was unexpected. 他和她结婚了,这是出乎意料的。(不可用as

◆摘自《中学英语高频词详解词典》◆

   

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