其基本意思為“與…一樣”，其中的第一個(gè)as為副詞，其后通常接形容詞或副詞(用原級(jí))，第二個(gè)as可用作介詞(后接名詞或代詞)或連詞(后接從句)。使用時(shí)應(yīng)注意以下幾點(diǎn)。如：

(1) 在否定句中，第一個(gè) 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(gè)as之間通常接形容詞或副詞的原級(jí)，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(cuò)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(shí)，有時(shí)該形容詞還可修飾另一名詞，但這個(gè)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(gè)as后接從句時(shí)，該as通常為連詞，但有時(shí)這個(gè)as還充當(dāng)其后從句的主語或賓語，此時(shí)該as實(shí)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?jí)蛄恕?/p>

(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(gè)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(gè)as引導(dǎo)一個(gè)表示將來意義的從句，則該從句可用現(xiàn)在時(shí)表示將來，也可直接使用將來時(shí)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(chǎng)合(尤其是美國(guó)英語中)，有時(shí)可以省略第一個(gè)as。如：

When over forty, he married a woman poor as himself. 他在40多歲時(shí)娶了一個(gè)像他本人一樣窮的女人。

另外，若意思明確，有時(shí)可省略第二個(gè)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(jī)會(huì)便宜些，但質(zhì)量沒那么好。

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