其基本意思為“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(yīng)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(xué)習(xí)不如他弟弟努力。

(2) 在該結(jié)構(gòu)的兩個as之間通常接形容詞或副詞的原級，但若涉及數(shù)量或程度，可用“as much+不可數(shù)名詞+as”和“as many+復(fù)數(shù)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么多錢。

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(yīng)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后接從句時，該as通常為連詞，但有時這個as還充當(dāng)其后從句的主語或賓語，此時該as實為關(guān)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。

(4) 該結(jié)構(gòu)根據(jù)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。

(5) 若第二個as引導(dǎo)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(guān)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(zhì)量沒那么好。

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