形容词，副词比较级和最高级的形式。

形容词比较级和最高级的变化规则：
1、 一般直接在词尾加 er/est: 如 tall—taller—tallest.
great strong quick long fresh few tall

2、 以 e 结尾的单词直接加-r/-st,如 wide—wider—widest.
nice brave fine strange late wide

3、 以辅音字母加 y 结尾的单词，把 y 变为 i，再加 er/est:
如 busy—busier—busiest.
lazy ugly happy lucky healthy busy

4、 以重读闭音节结尾且末尾只有一个辅音字母的单词，
双写末尾的辅音字母，再加 er/est: 如 big—bigger—biggest.
fat red thin hot wet

5、 部分双音节词，多音节词在词前面加 more 或 most
比较级: more + adj； 最高级: most + adj：
如 serious—more
serious—most serious.
interesting delicious carefully popular careful useful
dangerous beautiful important terrible active serious

6、 不规则变化：
good / well—better—best.
bad / ill—worse—worst.
many / much—more—most.
little / few—less—least.
far—farther / further—farthest / furthest.