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(jié)構(gòu)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.
(2)Your pen writes as smoothly as mine.你的鋼筆書寫起來和我的一樣流暢.
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(guān)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(dǎo)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.
一些帶有as...as結(jié)構(gòu)的常見短語歸納：
as busy as a bee像蜜蜂一樣忙碌
as easy as ABC像ABC一樣容易
as deep as a well像井一樣深
as light as a feather像羽毛一樣輕
as soft as butter像黃油一樣軟
as rich as a Jew像猶太人一樣富裕