as做介词，意思是“作为”；
例句：
French is known as the most beautiful language in the world.
法语以世界上最美丽的语言著称。
as做连词，引导时间状语从句，意思是当……的时候；
as做连词，引导原因状语从句，意思是因为。
as做连词，引导让步状语从句，意思是“虽然”
例句：
Young as he is, he has been one of the most famous painters in our country.
虽然他还很年轻，但已经成为我们国家最有名的画家之一。
as做连词，引导方式状语从句，意思是“以……方式”
例句：
Do as the Romans do when in Rome.
入乡随俗
as做关系代词，引导定语从句
例句：
This is the same game as I played yesterday.
这和我昨天玩的游戏一样。
as相关短语
as well 也;同样地;还不如
as well as 也;和…一样;不但…而且
as one 一致的
as soon 宁愿…，宁可… ,同样乐意，同样愿意(常用于 would，had 之后)[亦作 as lief] , 同样高兴(或愿意) , 宁愿,宁可(与 would, had 连用)
as soon as 一…就…
as long as 只要;和…一样长
as if 犹如，好似
as much 也;同样多的
as for 关于，至于
as soon as possible 尽快
as a whole 总的来说
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