heavy的比较级是heavier,最高级是heaviest,属于“辅音字母+y”结尾的双音节词,变化规则为变y为i后加-er/-est,类似easy(easier/easiest)、happy(happier/happiest)等。比较级heavier用于两者对比,表“更重的”,如“The blue box is heavier than the red one”;最高级heaviest用于三者及以上,表“最重的”,常加定冠词the,如“Among all suitcases, the black on...