词汇

2020考研英语常用词汇之:as的用法

来源:跨考2019-06-11

  六月份了,暑期将至,考研英语复习首先对于基础常识要有了解,复习之初最好把这些都搞明白,然后有针对性的开展复习,英语复习必然从背单词开始。下面分享了考研英语常用词汇:as的用法总结,希望对大家有所帮助。

  一、as作为介词的用法:

  1.表示“作为”,“以……身份”。例如:Tom found a job as a teacher.

  2.表示“像…一样”,例如:They were all dressed as policeman.

  二、as作为副词的用法:

  1.表示“与…等同”。如:They don’t have as many boxes.

  2.表示“像,如”。如:As before, he remained slient.

  三、as可作从属连词,作关系副词时可以引导比较、时间、原因及方式等四种状语从句,作关系代词时可以引导定语从句:

  (一)as作从属连词引导状语从句时:

  1.表示“在…期间,当…的时候”引导时间状语从句,要注意其与when、while的用法区别。as与when,while都是引导时间状语从句的从属连词,含义都是“当……的时候”。但它们有区别:用when时,从句的动作可以与主句的动作同时发生,也可以先于主句的动作发生;用while时,从句的动作为一过程,主句动作与从句动作同时进行或在从句动作过程中发生;用as时,主句和从句的动作同时发生,具有延续的含义。

  下列情形时,只用as,而不用when或while。

  1)表示两个同步发生的动作或行为,意思是“随着…的发展”。如:

  As time went on, she became more and more worried.

  As we get older, we become more and more interested in everything.

  2)用于表示同一个人的两种动作交替进行,指“一边…一边”。如:

  The girl sings as she goes to supermarket.

  He looked behind occasionally as he went forward in the forest.

  3)接在名词后面表示某一个年龄段时。如:

  As a young man, he was active in answering questions.

  4)表示两个短暂行为或事情几乎同时发生。如:

  I watched her as she read the book.

  I thought of it just as you opened your mouth.

  when作“当……的时候”解,可以指较短的时间,也可指一段时间。如:

  It was raining when he arrived at the factory.

  When I was at college, I could speak several foreign languages.

  while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:He was watching TV while his mother was cooking.

  2.as作“既然”、“由于”解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。与because,since相比,as一般放在句首,语气较弱,较口语化。如:

  As you’re not feeling well, you may stay at home.

  As he wasn’t ready, we went without him.

  3.as作“像”、“按照……的方式”解,引导方式状语从句。如:

  Leave things as they are.

  Remember, you must do everything as I do.

  4.表示“虽然,尽管”,引导让步状语从句,多在主句之前,且常用倒装语序,模式为:adj. /adv. /n. /v.+as+主语+谓语+主句。如:

  Young as he is, he knows much about electricity.

  Try as he did, he failed again.

  知识拓展:用于as…as或not / so/ as…as中,前一个as是副词,后一个as是连词,引导比较状语从句。如:

  They help the old as much as they can.

  I don’t speak English as well as she does.

  (二)as作从属连词引导定语从句时,表示“正如”:

  1.引导限制性定语从句。如:

  He isn’t the same person as he used to be.

  I have never heard such story as he is telling.

  I am not so strong a man as I was.

  2.引导非限制性定语从句,修饰整个主句或主句的一部分,可在句首、句中、句末。如:He is very careful, as we all know.

  As is well known, she has two sisters.

  This machine, as might be expected, has stopped operating.

  总之,通过以上的分析,我们对as的词性和用法有了比较全面的理解和把握,这样才能在实际的运用中做到心中有数,应付自如。

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