一、形容词、副词的比较级和最高级的用法：
当两种物体之间相互比较时，我们要用形容词或副词的比较级；当相互比较的物体是三个或三个以上时，用形容词或副词的最高级。
比较级
二者比较，标志词：than
最高级
三者以上比较，标志词：the
二、形容词、副词的比较级和最高级的变化规律：
1. 单音节形容词或副词后面直接加-er或-est tall—taller—tallest fast—faster—fastest
2. 以-e结尾的单音节形容词或副词直接加-r或-st large—larger—largest nice—nicer—nicest
3. 以-y结尾的形容词或副词，改-y为-i再加-er或-est busy—busier—busiest early—earlier—earliest
4. 形容词或副词是重读闭音节时，双写最后的辅音字母，再加-er或-est hot—hotter—hottest
5. 多音节形容词或副词前面直接加more或most beautiful—more beautiful—most beautiful
6. 以ly结尾的副词一般加more或most slowly—more slowly—most slowly
7. 不规则变化 good (well)- better-best bad (badly)-worse-worst little-less-least far-farther-further many（much）- more – most
三、形容词、副词的比较级和最高级用法：
比较级：
1、形容词：物体A + am / are / is + 形容词比较级 + than + 物体B
I am taller than you. This picture is more beautiful than that one.
2、副词：物体A + 行为动词 + 副词比较级 + than + 物体B.
He studies better than me.
最高级：
1、形容词：物体A + am / are / is + the + 形容词最高级 + 比较范围（of + 人/物，in + 地方）.
I am the tallest in the class. Shanghai is one of the biggest cities in China.
2、副词：物体A + 行为动词 + 副词最高级 + 比较范围（of + 人/物，in + 地方）.
Cheetahs run fastest in the world. He studies best of us.
表示两者对比相同：主语+谓语+as+形容词/副词原形+as+从句
This box is as big as mine. This coat is not so/as cheap as that one.
I study English as hard as my brother.