处于同等级别或数量级，通常是作为一个关联词(correlative)，跟在so或者as（常作为副词）的后面，so应该用在否定句中：

1 She is as sweet as bee honey.她就像蜂蜜一样甜美。(sweet是原级形容词，前面的as作副词)

2 The weather is not so good as you suggest.天气不像你说的那么好。（good是原级形容词，前面的so作副词，用于否定句）

 He doesn’t work so/as hard as the others.他工作不像别人那么努力。

 3 They don’t earn as much money as we do.他们赚的钱不如我们多。

The trees are not as many as they used to be.树没有以前那么多了。

注意：不可数名词前面用as much，可数名词前面用as many。

又注：They don’t earn as much money as us.他们赚的钱不如我们多。句中第二个as作为介词。

4 He runs as fast a speed as she (does).他跑得和她一样快。(形容词fast修饰后面的名词speed)

5 The road is three times as long as the other.这条路是另一条路的三倍长。

The horse runs not half fast as we expect it does.这匹马跑得不如我们预期的一半快。

The snail crept just as slow as I had said. 这蜗牛爬得和我说的一样慢。

注意：如上表示程度的词语，必须放在第一个as的前面，作为状语(相当于用另一个副词来修饰作副词用的第一个as)，像这样的词语，还有almost, exactly, nearly, nothing like, not quite, one-ten, 30 per cent, twice等。