as as的用法總結有哪些
以下是小編為大家整理的as...as的用法總結，希望能幫助大家更好地認識as...as這個詞組，提高英語水平。
一、基本意思為“與…一樣”，其中的第一個as為副詞，其后通常接形容詞或副詞(用原級)，第二個as可用作介詞(后接名詞或代詞)或連詞(后接從句)。使用時應注意以下幾點。如：
(1) 在否定句中，第一個 as 也可換成 so。如：
He doesn’t study as [so] hard as his brother. 他學習不如他弟弟努力。
(2) 在該結構的兩個as之間通常接形容詞或副詞的原級，但若涉及數量或程度，可用“as much+不可數名詞+as”和“as many+復數名詞+as”。如：
I haven’t got as much money as I thought. 我不像原來想像的有那么多錢。
You’ve made as many mistakes as I have. 你犯的錯誤和我犯的一樣多。
其間接形容詞時，有時該形容詞還可修飾另一名詞，但這個名詞應帶有不定冠詞(注意詞序)。如：
She is as good a teacher as her mother. 她和她媽媽一樣是位好老師。
也可說。如：She is a teacher as good as her mother.
但不說。如：She is as a good teacher as her mother. / They are as good teachers as us.
(3) 該結構根據情況可用使用以下修飾語。如：(not) nearly, almost, just, nothing like, exactly, not quite, half, one-ten, twice, three times, 30 per cent等，并且這些修飾語必須置于第一個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. 這件連衣裙比那件貴一倍。
(4) 第二個as后接從句時，該as通常為連詞，但有時這個as還充當其后從句的主語或賓語，此時該as實為關系代詞。如：
I gave him as much as he could eat. 他能吃多少，我就給了他多少。
We’ve got food for as many people as want it. 我們的食物，無論多少人吃都夠了。
(5) 若第二個as引導一個表示將來意義的從句，則該從句可用現(xiàn)在時表示將來，也可直接使用將來時態(tài)。如：
We’ll get there as soon as you do [will]. 你一到，我們就到。
(6) 在非正式場合(尤其是美國英語中)，有時可以省略第一個as。如：
When over forty, he married a woman poor as himself. 他在40多歲時娶了一個像他本人一樣窮的女人。
另外，若意思明確，有時可省略第二個as及其后的相關詞語。如：
The radios in that shop will be cheaper, but not as good. 那家商店的收音機會便宜些，但質量沒那么好。
二、“as + 形容詞或副詞原級 + as…” 意為“和……一樣”，表示同級的比較，但要注意第一個 as 為副詞，第二個 as 為連詞。根據比較對象和性質的不同又可以把此種結構分為三種：
(一)“ as … as …結構”用于表示不同人或物同一性質的比較，意為“……和……一樣…… " 。例如
The tree is as tall as the building(is) .
這棵樹和那棟樓一樣高。
注意此結構也常用于形象比喻中： as cool as cucumber 沉著的， as stubborn as a mule 非常頑強的，倔強的， as clear as crystal 非常透明的， as poor as a church mouse 非常貧困的， 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。這些短語生動活潑，淺顯易懂，記住這些短語可以提高學生的英語寫作和口語能力。
(二)“ as … as …結構”用于表示同一個人或物不同性質的比較，意為“既……又……” 。例如：
This swimming pool is as wide as it is long.
這個游泳池寬度和長度相等。
(三)“ as … as …結構”用于表示兩個人或物不同性質的比較，表示程度相同或相當，意為“……而……”。在否定句中結構是“ so/as…as… ”。例如：
He was as experienced as his brother was green .
他經驗豐富，而他兄弟卻涉世未深。
He was as handsome as his wife was beautiful .
他長得非常英俊，他的妻子也長得非常漂亮。
He cannot run so/as fast as you.
他沒你跑得快。
Danny is not so/as wise as he is witty .
丹尼為人風趣，但欠明智。
需要注意的是： “as + 形容詞或副詞原級 + as…” 結構的變體形式是“ as + 形容詞 + a + 單數名詞 + as 或 as + many/much + 名詞 + as ”。意為“……和……一樣…… " 。例如：
I don't want as expensive a car as this. = I don't want a car as expensive as this .
我不要這么貴的汽車。
This is as good an example as the other is.
這個例子和另外一個例子一樣好。
Tony is as clever a boy as his brother .
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