特征的比较
在对两种事物的特徵做比较时，我们会用到一套标准规则。
特徵相等时
要比较两个具有相等特徵的事物非常简单，我们会用这样的公式来表达：
as + 描述特徵的形容词 + as
举例
- Tom is as tall as his brother.
- I am as hungry as you are.
- Sally is as nice as Jane.
特徵不相等时
如果两个特徵不相等，可以用以下三种句型来表达，无论用哪一种，意思都是差不多的。
第一种：
not as + 描述特徵的形容词 + as
第二种：
less + 描述特徵的形容词 + than：这种句型会频繁地用在某些形容词。
第三种：
形容词比较级 + than：此结构需要改变词组的顺序，或用相对的形容词来表达。
举例
- Mont Blanc is not as high as Mount Everest.
- Mont Blanc is less high than Mount Everest.
- Mont Blanc is lower than Mount Everest.
- Mount Everest is higher than Mont Blanc.
- Norway is not as sunny as Thailand.
- Norway is less sunny than Thailand.
- Thailand is sunnier than Norway.
- Norway is cloudier than Thailand.