通常在形容词和副词后面加er,est
hard
harder
the hardest
词尾是不发音的单音节e时，加r,st
nice
nicer
the nicest
词尾是辅音+y的双音节时,去掉y加ier，iest
dry
drier
driest
以一个辅音结尾的重读闭音节时，双写最后一个字母，加er，est
hot
hotter
hottest
多音节和双音节，在形容词和副词前加
程度加强 more， the most
程度减弱 less the least
interesting
more/less interesting
the most/the least interesting
不规则变化
good better the best
many more the most
high higher , the highest
late, later, latest
heavy, heavier, the heaviest
thin, thinner, the thinnest
famous, more/less famous, the most/the least famous
little, less, the least
什么比什么更怎么样
He is taller than his brother.
The book is more expensive than the pen.
Her English is better than his.
在三个或三个以上的范围中最
Her is the tallest in his class.
The book is the more expensive of the three.
Her English is the best among the three.