下列形容词和副词的比较级和最高级有两种形式
cruel----- crueler, cruelest /
more cruel , most cruel
strict---- stricter , strictest /
more strict , most strict
often----- oftener , oftenest /
more often , most often
friendly------ friendlier , friendliest /
more friendly , most friendly
clever----- cleverer, cleverest /
more clever , most cleve