② as用法讨论：
conj. 当，正当，随着…… ；因为，尽管，按照
She dropped the cup as she stood up.
当她站起来时把杯子弄掉了。
Strange as it may seem, nobody was injured in the accident.
这次事故虽然看起来令人不可思议，却没有人受伤。
I'll do as you advise.
我会照你的建议去做。
adv. 相同，同样，就……而言
Peter runs fast, but I run just as fast.
彼得跑得快，我跑得也很快。
pron.依照……，如……，像……一样
He is a teacher, as is clear from his manner.
他是一位教师，从他的举止可以明显看出来。
prep. 像，作为
He got a job as a driver.
他找到了一份当司机的工作。
as的常用短语
as...as... 与……一样(用于肯定句)
not as / so...as 与……不一样(用于否定句)
as if / though 好像，似乎(从句用虚拟语气)
as soon as 一……就……
as long as 只要
so...as to 如此……以至于……
so as to 以便
as far 至于……，就……而言
such as 例如
use...as 把……用作