convenient比较级和最高级

more convenient,the most convennient
shorter,the shortest
easier,the easiest
more expensive,the most expensive
dirtier,the dirtiest
darker,the darkest
less,the least
more active,the most active
quicklier,the most quickliest
better,the best
farther,the farthest
worse,the worst
better,the best
carefullier,the carefulliest