as...as表示像...一样,(强调数量)多达,只有。通常中间只能用形容词或副词的原级,不能用比较级或最高级。若第二个as之后使用独立的人称代词,一般用主格(较正式)或宾格(非正式)均可。
1.若涉及数量或程度,可用“as much+不可数名词+as”和“as many+可数名词复数+as”。如:
He doesn’t pay as much tax as we do / as us. 他没我们交的税款多。
There are not as many restaurants as there were. 现在餐馆没有过去多了。
2.“as+形容词或副词原级+as...”意为“和...一样”,表示同级的比较,第一个as为副词,第二个as为连词。
(1)as...as结构用于表示不同人或物同一性质的比较,意为...和...一样
The tree is as tall as the building.这棵树和那栋楼一样高。
(2)as...as结构用于表示同一个人或物不同性质的比较,意为既...又...
This swimming pool is as wide as it is long.
这个游泳池宽度和长度相等。
(3)as...as结构用于表示两个人或物不同性质的比较,表示程度相同或相当,意为...而...,在否定句结构是so/as...as...
He cannot run so/as fast as you.他没你跑得快。
He was as handsome as his wife was beautiful.
他长得很英俊,他的妻子也长得非常漂亮。
3.as...as的常见句型
(1)as...as possible/sb can尽可能的……
Please answer my question as soon as possible.
请尽快回答我的问题。
The detective is searching the man as carefully as he can.
那个侦探正在尽可能仔细地搜查那个男子的身体。
(2)as...as usual/before像以前一样……
She looks as pretty as before.
她看起来和以前一样漂亮
Though they failed,they still worked as hard as usual.
尽管他们失败了,但他们仍像以前一样努力工作。
(3)as long as只要,引导条件状语从句
I will stay with you as long as there is a room free.
要是你有一间空余的房子,我就住在你这里。
You may borrow this book as long as you promise to give it back
只要你答应归还,你就可以把这书借走。