双方比较,表示一方超过另一方时,用“比较级+than”
This pen is better than that one.
表示一方不及另一方时,用“less+原级+than”
This park is less beautiful than that one.
表示一方随另一方程度而变化时,用“the+比较级（主语+谓语）,the+比较级（主语+谓语）”
The harder he works,the happier he feels.
不与其他事物比较,表示本身程度的改变时,用“比较级+and+比较级”结构
The girl becomes more and more beautiful.
表示倍数的比较级有一下几种句型：
a）A is three(four,etc.)times the size(height,length,etc.)of B.
b) A is three(four,etc.)times as big(height,length,etc.)as B.
c) A is three(four,etc.)times bigger(higher,longer,etc.)than B.
这些都是高中英语的基本语法,考得比较多,应该要弄清楚.