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as as的用法
一、基本用法
as ... as
用于比較句型,中間插入的是形容詞或副詞的原級。意思是"達到與什么相同的程度"。如：He is as strong as a horse. 他力大如牛。
二、習慣用法
1. as soon as
意思是"一......就......",引導一個時間狀語從句。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。
2. as long as
意思是"長達......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)上搜索有關恐龍的信息已經(jīng)長達三個小時。
3. as much as
意思是"高達......;與......一樣多"。是用來表達極其多的語氣。如：Some of the stones weigh as much as fifteen tons.有些石頭重達15噸。
★as...as用法：
as...as意為"和……一樣"，表示同級的比較。使用時要注意第一個as為副詞，第二個as為連詞。其基本結構為：as+ adj./ adv. +as。
例如：
(1)This film is as interesting as that one.這部電影和那部電影一樣有趣。
其否定式為not as/so +adj./ adv. +as。例如：
This dictionary is not as/so useful as you think.這本字典不如你想象的那樣有用。
若有修飾成分，如twice, three times, half, a quarter等，則須置于第一個as之前。
例如：
Your bag is twice as expensive as mine.你的袋子比我的貴一倍。
幾個關于as...as的常見句型：
(1)as...as possible
Please answer my question as soon as possible.請盡快回答我的問題。
(2)as...as usual/before
She looks as pretty as before.她看起來和以前一樣漂亮。
(3)as long as... (引導條件狀語從句)
It took us as long as three years to carry out the plan.我們花了長達三年的時間才完成這項計劃。
(4)as far as
He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火車站。
(5)as well as
She cooks as well as her mother does.她燒菜燒得跟她母親一樣好。
★as...as的結構：
as + 形容詞或副詞原級 + as
1)在否定句或疑問句中可用so… as。
He cannot run so/as fast as you.
2)當as… as 中間有名詞時采用以下格式。
as +形容詞+ a +單數(shù)名詞
as + many/much +名詞
This is as good an example as the other is.
I can carry as much paper as you can..
3)用表示倍數(shù)的詞或其他程度副詞做修飾語時，放在as的前面。
This room is twice as big as that one.
Your room is the same size as mine.
4) 倍數(shù)+ as + adj. + as <=> 倍數(shù)+ then + of
This bridge is three times as long as that one.
This bridge is three times the length of that one.
Your room is twice as large as mine.
Your room is twice the size of mine.
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