2)以ow，er，ly结尾的个别双音节形容词可以加 –er，-est构成比较级和最高级。
原级 比较级 最髙级
narrow narrower narrowest
early earlier earliest
clever cleverer cleverest
3)不规则变化。
原级 比较级 最髙级
good better best
bad, ill worse worst
many, much more most
little less least
far farther/further farthest/furthest
