1.as...as可以用在肯定句中,表示“像...一样”,后面的形容词或者副词要用原级：
She can run as fast as a deer.她能跑的像鹿一样快.
They work as hard as they do.他们工作像你一样努力.
2.在否定句中,as...as和so...as都可以用：
I don't go there as much as I used.我现在到那里不像过去那么多了.
I didn't do as (so)well as I should.我做的不如我应做的那么好.
3.这种句子中也可以有一个表示程度的状语：
I don't speak half as (so) well as you.我讲得不及你一半好.
She can read twice as fast as he does.她的阅读速度比他快一倍.