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as的语法特点归纳
作者:jdbook  文章来源:www.yygrammar.com  点击数  更新时间:2008-07-23  文章录入:admin  责任编辑:admin



as的语法特点归纳

 

1. 用作连词,表示让步 (意为:虽然,尽管),要用于倒装句,且倒装后位于句首的名词通常不用冠词 (等于though, 但语气稍弱)

Child as[though]he was, he did quite well. 他虽是个孩子,但已干得很不错。

2. 用作关系代词,主要用法有二:

(1) 用在such, same, as等之后,引导限制性定语从句:

This is the same watch as I lost. 这块表跟我丢失的那块一样。

Such men as (=Those men who) heard of him praised him. 听说过他的人都赞扬他。

(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 (常译为:正如)或之后 (常译为:这一点),且主从句之间一般要用逗号隔开:

He was absent, as is often the case. 他缺席了,这是常有的事。

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

3. 用来表示目的,下面两种句子结构都可以:

仔细写以便把每句话都写清楚。

正:Write carefully so as to make every sentence clear.

正:Write so carefully as to make every sentence clear.

4. 在正式文体 (尤其是文学体裁)中,as后可用倒装语序表示“…也一样这类意思 (现代英语通常so表示这一用法)

He travelled a great deal, as did most of his friends. 他去过许多地方旅游,他的多数朋友也是一样。

He plays the piano, as does his mother. 他会弹钢琴,他母亲也会。

5. 用于 as if (from www.yygrammar.com)

as though, 意为仿佛似乎。两者一般可通用 (但注意不能说 as although)。用法上注意几点:

(1) as if [though] 可引导状语从句和表语从句,从句谓语根据语义的要求,可用陈述语气 (若可能为事实)或虚拟语气 (若为假设或不太可能是事实)

It looks as if it is going to rain. 天似乎要下雨了。

It seems as if you’re right. 似乎你是对的。

He talks as though he knew everything. 他夸夸其谈,好像无所不知。

When a pencil is partly in a glass of water, it looks as if it were broken. 当把一支铅笔的一部分放在一杯水里时,它看起来好像折断了似的(from www.yygrammar.com)

当主句谓语是过去时态时,从句谓语常可用陈述语气:

He paused as though he found a difficulty. 他停了下来,似乎遇到了一个难题。

She felt as if she lost something. 他觉得似乎丢了什么东西。

(2) 当从句主语与主句主语一致,且从句谓语中又包括有动词be时,从句主语及其谓语中的动词be通常可以省去:

From time to time he turned round as though (he was) searching for someone. 他不时地四下张望,好像在找人。

He opened his mouth as if (he was)to speak. 他张开口,好像要说话似的。

 

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