1、形容词表示某一事物或人的特征，副词表示某一动作的特征。形容词和副词有三种形式：原形、比较
级、最高级。比较级：+er 最高级：the +est
两个重要特征：asas中间一定用原形，than的前面一定要+er。
2、形容词、副词比较级的规则变化如下：
（1）一般直接+er。如：tall - taller, fast - faster 单音节词如果以-e结尾，只加-r。如：late - later
（2）重读闭音节词如末尾只有一个辅音字母，须双写这个字母，再加-er。如：big - bigger, fat - fatter
（3）以辅音字母加-y结尾的词，变y为i，再加-er。如：heavy - heavier, early - earlier
（4）双音节和多音节词的比较级应在原级前加more构成。如：beautiful - more beautiful,
careful - more careful, quietly - more quietly, interesting - more interesting
（5）有些不规则变化的，须逐一加以记忆。如：good/well - better, bad/ill - worse, many/much - more, far - farther/further, old - older/elder
练一练：
1、写出下列形容词、副词的比较级。
big
good
long
tall
old
short
thin
heavy
young
fat
light
strong
high
far
low
early
late
well
fast
slow
2、用括号内所给单词的适当形式填空。
1) I can swim as _______ ( fast ) as the fish, I think.
2) Look! His hands are _______ ( big ) than mine.
3) I think you do these things_______ ( well ) than your classmates.
4) Whose bag is _______ ( heavy ), yours or mine?
5) Does Jim run as _______（slow ) as David? Yes, but Mike runs_______ ( slow ) than them.
6) You have seven books, but I have _______ ( many ) than you. I ha ve ten.
7) I jump _______ ( far ) than some of the boys in my class.
8) Im very_______ ( thin ), but shes _______ ( thin ) than me.
9) It gets _______and_______ ( warm ) when spring comes here.