表示性质的形容词，通常用词形的变化来表示事物的等级差别。共有三种形式：原级、比较级、最高级。下面让我们看一下形容词比较比较常见的句型同级比较和降级比较用法
一、同级比较
1.由“…as + 形容词原型 + as…”或“…as + 形容词 + 名词 + as…”构成。
例句1：Exercise is as useful a way as any other to lose unwanted weight.
例句2：I try to find as much information as I can about what happened.
2.由“…not so （as） + 形容词或副词原型 + as…”或“…not so （as） + 形容词 + 名词 + as…”构成。
例句：Luckily， the weather is not so wet as it is today.
二、降级比较
1.由“…形容词比较级+ than…”构成。
例句：He is more concerned about others than about himself.
2.由“…many / much more + 可数 / 不可数名词 + than…”
例句：My friend earned much more money than I did last year.
