as/强æz; 弱əz/

ad. [as ... as ...] used to compare two people, things, etc.

conj.

➊ because

➋ while

➌ in the way that sb says or that sth happens

prep.

➊ used to describe the purpose or quality of sb/sth

➋ when sb was in a particular age group

ad. [as ... as ...，第一个as为副词，第二个as为介词或副词] 像…一样：[as ... as sb/sth] Her younger sister is as tall as her（或she）. 她妹妹与她一样高。

◇His bag is as big as mine/Tom's. 他的包与我的/汤姆的一样大。

◇hair as white as snow 雪白的头发

◇[倍数 + as ... as sb/sth] He earns twice as much as her. 他赚的是她的两倍。

◇[as ... as I thought/imagined] It's not as hard as imagined 没有想象的那么难。

◇I will come back as soon as possible (= as soon as I can). 我会尽快回来的。

conj.

➊ 由于：As it was getting late, I decided to go back. 由于天色渐晚，我决定回去。

➋ 当…时，随着：As time passed, he became more friendly. 随着时间的流逝，他变得更友好了。

➌ 照…的方式，正如：Do as I say. 按我说的去做。

◇As you know, he rarely agrees with me. 你是知道的，他很少与我意见一致。

prep.

➊ 作为，当作：She works as a shop assistant. 她的工作是售货员。

◇The problem is regarded as serious. 这个问题被认为很严重。

◇As a parent, you must protect your children. 作为父母，你必须保护你的孩子。

➋ 处于…年龄段时：As a young man, he studied in England. 他年轻时在英国求学。

as for sb/sth 关于，至于：As for John, he became an actor. 至于约翰，他后来做了演员。

as if ... 好像，似乎：He looks as if he is sick. 他看上去病了。

◇[as if +虚拟语气] He talks to me as if he were my teacher. 他跟我说话好像是我的老师。

as it is 实际上；照现状：I thought we would arrive on time but as it is we may be one hour late. 我本想我们将准时到达，但实际上可能会迟到一个小时。

◇Leave everything as it is. 原封不动任何东西。

as it were 可以说，在一定程度上：His retirement was, as it were, the beginning of his real career. 他的退休可以说是他真正事业的开始。

as though ... = as if ...

常犯错误

✗ He has as a nice pen as mine.

✓ He has as nice a pen as mine. 他有一支钢笔，跟我的一样漂亮。

[✌形容词前有as时，a/an要置于形容词之后、名词之前，类似位置的词还有how, so, too]

常犯错误

✗ She swam as a fish.

✓ She swam like a fish. 她像鱼一样游泳。

常犯错误

✗ As she didn't catch the bus, so she walked home.

✓ As she didn't catch the bus, she walked home. 她没赶上公车，所以步行回家。

[✌as表示“因为”时，不能与so连用]

常犯错误

✗ As I was at school, I didn't have a cellphone.

✓ When I was in school, I didn't have a cellphone. 我上学时没有手机。

[✌as表示“当…时”之意时，主句和从句的动词常表达具体的动作，强调动作的同时性]

用法as ... as sb/sth 结构中sb/sth如果是人称代词，可用主格或宾格。如：I run as fast as he （或him）. = I run as fast as he does.

辨析as; because; for; since

辨析as; like

辨析as ... as; so ... as

辨析as; when; while