As+形容詞或副詞+aspossibe,意思是"盡可能……的"。例句：We have to run as fast as possible.我們得盡可能快的跑。（fast屬于副詞）

as慣用法

1. as soon as

意思是"一......就......",引導(dǎo)一個(gè)時(shí)間狀語(yǔ)從句。如：I'll call you as soon as I finish my homework. 我一完成我的作業(yè),就給你打電話(huà)。

2. as long as

意思是"長(zhǎng)達(dá)......之久；只要......"。如：She has searched the information about dinosaurs on the Internet as long as three hours. 她在因特網(wǎng)上搜索有關(guān)恐龍的信息已經(jīng)長(zhǎng)達(dá)三個(gè)小時(shí)。

3. as much as

意思是"高達(dá)......；與......一樣多"。是用來(lái)表達(dá)極其多的語(yǔ)氣。如：Some of the stones weigh as much as fifteen tons.有些石頭重達(dá)15噸。

as...as用法：

as...as意為"和……一樣"，表示同級(jí)的比較。使用時(shí)要注意第一個(gè)as為副詞，第二個(gè)as為連詞。其基本結(jié)構(gòu)為：as+adj./adv.+as。