原形,比较级,最高级 　　easy,easier,easiest 　　busy,busier,busiest 　　slowly,moreslowly,mostslowly 　　pretty,prettier,prettiest 　　funny,funnier,funniest 　　dirty,dirtier,dirtiest 　　beautiful,morebeautiful,mostbeautiful 　　interesting,moreinteresting,mostinteresting