[介词]以...的角色,以...的形式：He worked for a while as a logger,The
news came as a shock.
[副词]和形容词、副词搭配使用表示比较:It's not as hot today. I can type
almost as fast as you.
[连词]
(1) 当....的时候：The phone rang just as I was leaving.
(2) 因为: As you're new here,I'll give you a hand.
(3)照....方法,正如....: We'd better leave things as they were when we arrived.
语法结构
1 分句 | + as | + 分句
as | + 分句 , | + 分句
The people cheered the doldiers as they marched past.
As we were leaving,the sun came out.
表示在某事发生的时候另一件事正在发生。
You go first,as you know the way.
As Friday is a holiday,the banks will be closed.
给出做某事的理由
I prefer the office as it was,with the desk opposite the door.
Fasten the seat belt,as shown.
谈论某事的存在方式或处理方式
2 as | + 形容词/副词 | + as | +名词短语/分句/形容词
Terry is nearly as tall as her brother.
She swims well,but not as well as you (do).
Your exam results were not as bad as you think.
I'll do it as soon as I can(OR: as soon as possible).
比较两件事的性质,或两个人的能力,或是将某事与某个标准进行比较。
3 名词短语 | +动词 | + as | + if/though | + 分句
It looks as if it's going to rain.
You sound as though you've got a cold.
谈论外在的表象
搭配
带介词as的常用动词短语有: serve as , use something as ,be known as,
be regarded as ,be seen as, be considered as ,be defined as
The carrying case also serves as a convenient work surface when travelling.
Beethoven's Third Symphony(also known as the Eroica) was composed in 1805.
Motivation is sometimes defined as goal-oriented effort.
在书面报告或说明性文字里,as 经常引导具有前指或后指功能的分句
As we have seen,the best method of preventing...
As shown in diagram 6.1 ...
As we shall see in Chapter 5...
经常用在as ... as (语法结构2)前面的状语有:almost,nearly,at least 和just,此外,
还有像twice,three times,half这样的表达方式
That giraffe is almost as tall as the tree.
This restaurant is just as expensive as the other one
Dave works twice as hard as Cameron
固定短语
as well as
just as well
as for 至于
As for the postal strike,I think that ...
转移至另一个主题
such as ... = for example 例如
Many tropical fruits,such as mangos and papayas,are available in your local
supermarket nowadays.
as yet = until now 直到现在
I don't have any news as yet,but we expect to hear from them soon.
as it is / as it was ...实际上
The plane was meant to arrive at 5.30,but as it was ,we didn't get there till midnight.
说明现在或过去某时的真实情况
as long as