2、as做連詞，引導時間狀語從句，意思是“當……的時候”
例句：
My mother was cooking fish as I arrived home.
當我到家的時候，我媽媽正在做魚。
3、as做連詞，引導原因狀語從句，意思是“因為”
例句：
As rain has fallen, the air is cooler.
因為下過雨，所以空氣比較涼爽。
4、as做連詞，引導讓步狀語從句，意思是“雖然”
例句：
Young as he is, he has been one of the most famous painters in our country.
雖然他還很年輕，但已經成為我們國家最有名的畫家之一。
5、as做連詞，引導方式狀語從句，意思是“以……方式”
例句：
Do as the Romans do when in Rome.
入鄉隨俗
6、as做關系代詞，引導定語從句
例句：
This is the same game as I played yesterday.
這和我昨天玩的游戲一樣。
as相關短語
as well 也;同樣地;還不如
as well as 也;和…一樣;不但…而且
as one 一致的
as soon ◎寧愿…，寧可… , ◎同樣樂意，同樣愿意(常用于 would，had 之后)[亦作 as lief] , ◎同樣高興(或愿意) , ◎寧愿,寧可(與 would, had 連用)
as soon as 一…就…
as long as 只要;和…一樣長
as if 猶如，好似
as much 也;同樣多的
as for 關于，至于
as soon as possible 盡快
as a whole 總的來說
as far as adv. 至于，直到，遠到;就…而言
as of 自……起
as though 好像;仿佛
as being 就是;即像
as early as 早在…的時候
as usual 像往常一樣;照例
as good as 和…幾乎一樣，實際上等于…
as per 按照，依據;如同
as such 同樣地;本身;就其本身而論