形容词/副词的比较级与最高级的具体用法：
1.比较级用于两个人或事物之间的比较（不一定每一方只有一个人或一个事物），常与than连用；
Kitty is thinner than Mary.
My room is bigger than yours.
形容词比较级+and+形容词比较级，表示“越来越...”；
Its getting hotter and hotter in summer.
He is getting fatter and fatter.
The+形容词比较级...,The+形容词比较级...表示“越...就越...”；
The sooner the better.
The more you study,the more you know.
2.最高级用于三者或三者以上人/事物的比较，表示“最...”，前面+定冠词the；
Petter is the tallest boy in his class.
Shanghai is one of the biggest cities in the world.
