A．adj / adv + er / est
poor→poorer→poorest fast→faster→fastest
B．词尾e + r / st
large→larger→largest fine→finer→finest
C．重读闭音节中短元音 + 辅音词尾→双写辅音词尾 + er / est.
big→bigger→biggest hot→hotter→hottest
D．辅音 + y→i + er / est
dry→drier→driest angry→angrier→angriest
E．多音节形容词及副词：
more + adj / adv most + adj / adv
F．不规则变化：
good / well→better→best
bad / ill→worse→worst
many / much→more→most
little→less→least
late→later→ / latest
late→latter→last
far→farther→farthest
far→further→furthest
还有的要靠自己总结~