as…as是什么意思?用法?

as…as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”“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。意思包括和……一样、当……的时候、因为、尽管等。

as...as的意思和用法

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。