clever的比较级,比较级的用法

写出下列单词的比较级和最高级 clever— cleverer—cleverest safe
est fast ╟ faster ╟ fastest high ╟ higher ╟ highest clever
如: clever—cleverer—cleverest cheap—cheaper—cheapest few—
few,clever,useful,careful的比较级和最高级
比较级的特殊用法ppt