clever的比较级和最高级是clever more clever most clever clever ,还是cleverer,cleverest

clever
cleverer,cleverest
more clever ,most clever
两种都可以
此外还有
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