cool ugly peetty litter many heavy often的比较级和最高级是什么

cooler coolest
uglier ugliest
是pretty吧？prettier prettiest
是little吧？less least 如果是litter(垃圾)的话在前面加more表示更多
more most
heavier heaviest
often没有 ,比often程度高的是usually和always
more interesting most intereating
more slowly most slowly

cooler,uglyer,more peetty,more,heavier,oftener

cooler
uglier
应该是pretty吧？prettier
much litter
more
heavier
often没有 often是adv
much interesting
slow有slower slowly没有