首先先来复习「As」到底有多少种意思，不说你都来不知道它有以下6种常见不同意思的用法吧!
1. 作为…(介系词)
She works as a waitress. (她的工作是作为一个服务生。)
2. 用于比较；指称程度 (adv.)
I can’t run as fast as you. (我不能跑得像你一样快。)
3. 因为…(连结词conj.)
As it was getting late, I decided to book into a hotel. (由于现在越来越晚了，我决定预约一家旅店。
4. 如同…(连接词)
He got divorced, (just) as his parents had done years before. (他离婚了，就如同他双亲几年前一样。)
5. 当…时候 (连结词conj.)
He gets more attractive as he gets older. (当他变老时显得更有魅力。)
6. 虽然 (连结词conj.) = Although
Angry as he was, he couldn’t help smiling. (虽然他很生气但他还是忍不住地笑了。)
常见的四个由「 As 」所组成的连接词/片语:
1. As long as 只要…
as long as 最常用于条件句当中，意思是「只要…就…」，例如「只要达成Ａ，Ｂ就会成立」。另一个用法是「长达…」的意思，可用于时间之前，以下提供几句例句分别是 as long as 的三种意思和用法 :
只要（在一段时间内）…就会…
I’ll remember you as long as I live. (只要我还活着，我就会一直记得你。)
只要（达成某件事）…就可以
B as long as A (只要达成A, B就可以成立)
We can play, as long as it doesn’t rain. (只要不下雨, 我们就能玩。)
I’ll help as long as you be quiet. (只要你安静我就会帮你。)
长达…（时间）
用以夸饰或强调时间的「长度」，可以翻译成根本长达…(时间)
The conference could be as long as four hours. (这个研讨会根本就会长达四小时。)
2. As soon as 一…就…
Soon的意思是 「很快」，所以 as soon as 的意思用法是「一…就…」，用来连接两个发生时间点相同或相近的事件，在使用上要特别注意前后的时态，区分出事情的先后顺序。
例句：
I’ll tell him as soon as I see him. (我一见到他就告诉他。)
3. As well as (conj.) 也；又
She is a talented musician as well as being a photographer. (她不但是摄影师还是个很有才华的音乐家。)
4. As far as (conj.) 达到…的程度；就…而言
As far as I can know, this is the best choice we have now. (这是目前就我知道我们最好的选择。)
5. As if 好像, 似乎；仿佛 (= as though)
用于陈述语气和虚拟语气。陈述语气通常是描述一个人的状态；而虚拟语气则是表示与事实相反。
I felt as though I’d been lying in the sun for hours. (我感觉就像我已经在阳光下躺了几小时。)
They stared at me as if I was crazy. (他们看着我就好像我已经疯了一样。)
