as as的用法总结有哪些
以下是小编为大家整理的的用法总结，希望能帮助大家更好地认识这个词组，提高英语水平。
一、基本意思为“与…一样”，其中的第一个as为副词，其后通常接形容词或副词(用原级)，第二个as可用作介词(后接名词或代词)或连词(后接从句)。使用时应注意以下几点。如：
(1) 在否定句中，第一个 as 也可换成 so。如：
He doesn’t study as [so] hard as his brother. 他学习不如他弟弟努力。
(2) 在该结构的两个as之间通常接形容词或副词的原级，但若涉及数量或程度，可用“as much+不可数名词+as”和“as many+复数名词+as”。如：
I haven’t got as much money as I thought. 我不像原来想像的有那么多钱。
You’ve made as many mistakes as I have. 你犯的错误和我犯的一样多。
其间接形容词时，有时该形容词还可修饰另一名词，但这个名词应带有不定冠词(注意词序)。如：
She is as good a teacher as her mother. 她和她妈妈一样是位好老师。
也可说。如：She is a teacher as good as her mother.
但不说。如：She is as a good teacher as her mother. / They are as good teachers as us.
(3) 该结构根据情况可用使用以下修饰语。如：(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等，并且这些修饰语必须置于第一个as之前，而不能置于其后。如：
He doesn’t play half as well as his sister. 他演奏的水平不及他姐姐的一半。
This dress is twice as expensive as that. 这件连衣裙比那件贵一倍。
(4) 第二个as后接从句时，该as通常为连词，但有时这个as还充当其后从句的主语或宾语，此时该as实为关系代词。如：
I gave him as much as he could eat. 他能吃多少，我就给了他多少。
We’ve got food for as many people as want it. 我们的食物，无论多少人吃都够了。
(5) 若第二个as引导一个表示将来意义的从句，则该从句可用现在时表示将来，也可直接使用将来时态。如：
We’ll get there as soon as you do [will]. 你一到，我们就到。
(6) 在非正式场合(尤其是美国英语中)，有时可以省略第一个as。如：
When over forty, he married a woman poor as himself. 他在40多岁时娶了一个像他本人一样穷的女人。
另外，若意思明确，有时可省略第二个as及其后的相关词语。如：
The radios in that shop will be cheaper, but not as good. 那家商店的收音机会便宜些，但质量没那么好。
二、“as + 形容词或副词原级 + as…” 意为“和……一样”，表示同级的比较，但要注意第一个 as 为副词，第二个 as 为连词。根据比较对象和性质的不同又可以把此种结构分为三种：
(一)“ 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…… " 。例如
The tree is as tall as the building(is) .
这棵树和那栋楼一样高。
注意此结构也常用于形象比喻中： as cool as cucumber 沉着的， as stubborn as a mule 非常顽强的，倔强的， as clear as crystal 非常透明的， as poor as a church mouse 非常贫困的， as busy as a bee 像蜜蜂一样忙碌， as easy as ABC 像 ABC 一样容易， as deep as a well 像井一样深， as light as a feather 像羽毛一样轻， as soft as butter 像黄油一样软。这些短语生动活泼，浅显易懂，记住这些短语可以提高学生的英语写作和口语能力。
(二)“ 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……” 。例如：
This swimming pool is as wide as it is long.
这个游泳池宽度和长度相等。
(三)“ 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……”。在否定句中结构是“ so/as…as… ”。例如：
He was as experienced as his brother was green .
他经验丰富，而他兄弟却涉世未深。
He was as handsome as his wife was beautiful .
他长得非常英俊，他的妻子也长得非常漂亮。
He cannot run so/as fast as you.
他没你跑得快。
Danny is not so/as wise as he is witty .
丹尼为人风趣，但欠明智。
需要注意的是： “as + 形容词或副词原级 + as…” 结构的变体形式是“ as + 形容词 + a + 单数名词 + as 或 as + many/much + 名词 + as ”。意为“……和……一样…… " 。例如：
I don't want as expensive a car as this. = I don't want a car as expensive as this .
我不要这么贵的汽车。
This is as good an example as the other is.
这个例子和另外一个例子一样好。
Tony is as clever a boy as his brother .
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