as as的用法
as可以用作介词、副词和连词的成分组成句子
一, as 作介词
意思是 “作为”,“以…身份”,“如同”
(1) Alfred worked as a dustman for the Ellesmere Corporation. 阿尔弗雷德在Ellesmere公司当清洁工。
(2) People who work in offices are frequently referred to as “white-collar” workers. 坐办公室的人常常被称作”白领工人”。
二,as作连词的用法
1. as…as, 意为 ”和…一样”, 用于形容词或副词的比较,as + adj/adv + as…, 第一个as为副词,第二个as为连词
2. 引导时间状语从句,“随着”, “当…时”,和when, while用法相同,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.例如:
(1) When she was young, she lived with her grandparents. 她小时候和祖父母住在一起。
(2) I was preparing our dinner while you were sleeping. 你睡觉的时候我在准备晚餐。
(3) You will grow wiser as you grow older. 随着年龄增长你会变的越来越聪明。
3. 引导原因状语从句,“由于”, “因为”, 和because, since用法相同,但他们有区别:because表示的语气最强;as一般放在句首,语气较弱,较口语化;since常常用在书面语中,表示多为对方已知的、或稍加分析便可得知的原因,有时可译作"既然".例如:
As there were not enough lifeboats for everybody, 1500 lives were lost. 由于没有足够的救生艇运载所有乘客,结果1500人丧生。
4. 引导让步状语从句,”尽管”, “虽然”, 句子结构稍有不同,例如:
Old as he is, he still jogs every day. 他尽管上了年纪,仍然每天慢跑。
三,as作关系代词,引导定语从句
1. as引导定语从句与其他词连用
①用于the same...as结构中
②用于such...as结构中
③用于"so +adj. + a/an + n. (单数) + as "结构中
2. as单独引导定语从句,as单独引导定语从句时,先行词可以是一个词,也可以是一个句子或短语.例如:
(1) She is late, as is often the case.她迟到了,这是经常的事。(修饰的是整个主句)
IV. 几个关于as 的固定搭配:
(1)as...as possible
(2)as...as usual/before
(3)as long as... (引导条件状语从句)
(4)as far as
(5)as well as
(6) as if/as though 似乎,好像,仿佛
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介词:
像,如同;作为,当作,后跟名词或短语
常用短语:such as, as a/an+ 职业
副词:
① as...as (比较时用)像…一样
注意:第一个as为副词,否定时可以
换成so,第二个as是连词,后可跟短语或句子。这个短语也用于比较状语从句
中。
②(指事情以同样的方式发生)和…一样
As always,he said little.
他和平时一样,少言寡语。
连词:
引导五大状语从句
① 当..时,一面…一面.(时间状
从),强调主从动作同时发生,通常不
像while用进行时,而只用一般过去时。 The students took notes as they listened.
② 因为,由于(原因状从),从句通
常放句首,语气较弱,所表示的原因比
较明显或是已知事实。
As you were out,i left a message.③ 尽管,虽然,即使(让步状从),
常用倒装,句式为: 名词/形容词/副词/动词+as+主+谓(助动词).
Happy as they were,there was something missing.
④ 照...方式(方式状从) They did as l had asked.
⑤ 像...一样(比较状从),从句通常省略主句中相同的部分。
You're as tall as your father.