as+形容詞/副詞+as或as+形容詞+名詞+as。固定用法“as...as possible”意為“盡可能地...”,例如“as quicky as possible盡可能地快”，“as much as possible 盡可能地多”，“as carefully as possible 盡可能地小心”等等。

1.as...as結(jié)構(gòu)的基本意思是“與……一樣”，其中接形容詞或副詞的原級(jí)，在否定句中，第一個(gè)as也可換成so。如：

He doesn't study as/so hard as his brother. 他學(xué)習(xí)不如他弟弟努力。

2.若涉及數(shù)量或程度，可用“as much+不可數(shù)名詞+as”和“as many+可數(shù)名詞復(fù)數(shù)+as”。如：

He doesn’t pay as much tax as we do / as us.他沒(méi)我們交的稅款多。

There are not as many restaurants as there were.現(xiàn)在餐館沒(méi)有過(guò)去多了。

3.as...as接形容詞時(shí)，有時(shí)該形容詞還可修飾另一名詞，但這個(gè)名詞應(yīng)帶有不定冠詞（注意詞序）。如：

I have as good a voice as you.我的聲音和你一樣好。