若要在两个相等数量的事物上做比较，我们会套用这个公式：
as 表明分量的形容词 （名词） as
至于要使用的分量形容词为何，取决于比较的名词是可数还是不可数。
可数名词
若比较的名词是可数的，则用 as many 以及 as few。要注意，当前面的句子已表明比较的事物为何，就可以不重复，下面最后一个例句针对此情况来示范。
举例
- they have as many children as we do.
- we have as many customers as they do.
- tom has as few books as jane.
- there are as few houses in his village as in mine.
- you know as many people as i do.
- i have visited the states as many times as he has.
- i have three brothers. that's as many as you have.（从第一个句子可看出要比较的事物是「brothers」）
不可数名词
若比较的名词是不可数的，则用 as much 以及 as little。要注意，当前面的句子已表明比较的事物为何，就可以不重复，下面最后一个例句针对此情况来示范。
举例
- john eats as much food as peter.
- jim has as little patience as sam.
- you've heard as much news as i have.
- he's had as much success as his brother has.
- they've got as little water as we have.
- i'm not hungry. i've had as much as i want.（由第一个句子可知，後面要比较的事物是「food」）