1.表示像…；如同…，和…一样
例如：The child can sing as sweetly as a nightingale.
这个孩子唱歌像夜莺一样甜美。
2. such as 例如，表示举例
例如：I have a lot of hobbies, such as jogging, swimming, and playing basketball.
我有很多爱好，比如慢跑，游泳和打篮球。
3.当作，认为（regard as）
例如：It was regarded as a miracle. He's regarded as the black sheep of his family.
他被认为是家族的败家子。
4.因为，表示原因，
例如：You can't get out of the mess, as you're responsible for it.
你没法摆脱这个乱摊子，因为你对此有责任。
5.表示在…期间，同时，
例如：I try to remember everything as I read.
我试图边看书边记住一切看到的东西。
6. 以某种身份或角色，扮演某种角色，
例如：I'm telling you the truth, as your friend.
我以朋友的身份告诉你事实真相。
7.as a matter of fact 事实上，
例如：As a matter of fact, he doesn't even know what happened.
事实上，他甚至都不知道发生了什么。
8. as far as 就……而言，到某种程度
例如：As far as I could remember, I did tell you about that.
我记得我确实告诉你了的。
9. as if犹如，好似，
例如：It looks as if she's about to leave.
看样子她似乎是要离开了。
It tastes as if it has gone bad.
尝起来似乎已经变质了/馊了。
10.as soon as possible（ASAP）尽快，
例如：You need to finish the report as soon as possible.
你得尽快完成这个报告。
11.as long as 只要，
例如：I won't leave as long as you need me.
只要你需要我，我就不会离开的。
You can borrow my car as long as you promise to be careful.
我可以把我的车借给你只要你能保证小心使用。
12.as a rule 通常地，一般来说，
例如：As a rule I get up at 6:00 every morning.
我通常每天早上六点钟起床。
13.as to对于，关于，
例如：As to your question, I'll answer it tomorrow.
对于你的问题，我明天再回答。
14.as for关于，对于，说起，
例如：As for this car, there's nothing wrong with it.
对于这辆车，什么毛病都没有。
As for her, I don't want to say anything.
对于她，我没什么好说的。
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