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2017年高考英语词汇as的用法详解
1.用作连词,表示让步 ,要用于倒装句,且倒装后位于句首的名词通常不用冠词 。如:
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。如:
用在such, same, as等之后,引导限制性定语从句。如:
This is thesame watch as I lost. 这块表跟我丢失的那块一样。
Such men as heard of him praised him. 听说过他的人都赞扬他。
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 或之后 ,且主从句之间一般要用逗号隔开。如:
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。如:
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 中,as后可用倒装语序表示“…也一样”这类意思 。如:
He travelled agreat 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。
注:用作连词,表示原因 ,表示时间 。
5. 用于 as if
as though, 意为“仿佛”、“似乎”。两者一般可通用 。用法上注意几点:
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 或虚拟语气 。如:
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 asthough he knew everything. 他夸夸其谈,好像无所不知。
When apencil is partly in a glass of water, it looks as if it werebroken. 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。
当主句谓语是过去时态时,从句谓语常可用陈述语气。如:
He pausedas 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。
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。如:
From time to time heturned round as though searching for someone. 他不时地四下张望,好像在找人。
He opened his mouth as if to speak. 他张开口,好像要说话似的。
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