其基本意思爲“與…一樣”，其中的第一個as爲副詞，其後通常接形容詞或副詞(用原級)，第二個as可用作介詞(後接名詞或代詞)或連詞(後接從句)。下面小編爲大家介紹用法的詳細說明，希望對大家有用。 用法的詳細說明如下： (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+複數名詞+as”。如： You’ve made as many mistakes as I have. 你犯的錯誤和我犯的一樣多。 I haven’t got as much money as I thought. 我不像原來想像的有那麼多錢。 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) 第二個as後接從句時，該as通常爲連詞，但有時這個as還充當其後從句的主語或賓語，此時該as實爲關係代詞。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。 (4) 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，並且這些修飾語必須置於第一個as之前，而不能置於其後。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。 (5) 若第二個as引導一個表示將來意義的從句，則該從句可用現在時表示將來，也可直接使用將來時態。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及其後的相關詞語。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，但質量沒那麼好。 “as + 形容詞或副詞原級 + as…” 意爲“和……一樣”，表示同級的比較，但要注意第一個 as 爲副詞，第二個 as 爲連詞。根據比較對象和性質的不同又可以把此種結構分爲三種： （一）“ as … as …結構”用於表示不同人或物同一性質的比較，意爲“……和……一樣…… " 。例如 The tree is as tall as the building(is) ． 這棵樹和那棟樓一樣高。 注意此結構也常用於形象比喻中： as cool as cucumber 沉着的， 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”用於表示同一個人或物不同性質的比較，意爲“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”用於表示兩個人或物不同性質的比較，表示程度相同或相當，意爲“……而……”。在否定句中結構是“ so/as…as… ”。例如： 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 was as experienced as his brother was green ． 他經驗豐富，而他兄弟卻涉世未深。 He cannot run so/as fast as you. 他沒你跑得快。 Danny is not so/as wise as he is witty ． 丹尼爲人風趣，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 ”。意爲“……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 ． 我不要這麼貴的汽車。 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 ．
