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  “ as … as …结构”在英语中用法较多,学生在平时的学习中会频繁地接触到此种结构。有部分学生认为“ as … as… 结构”中只能出现形容词或副词并且认为此结构只能用于原级比较,这种认识是单一的。实际上 “ as … as… 结构”经过不同变化可以构成不同的短语和句式,这些短语和句式被灵活地运用于课文和练习中。如果学生对此结构的用法了解不多,就会在平时的学习中遇到障碍。为了帮助学生清除障碍,笔者就“ as … as… 结构”的几种用法介绍如下:

  “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 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 was as experienced as his brother was green .

  他经验丰富,而他兄弟却涉世未深。

  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 .