young-yonger-yongestold –older -oldest tall-taller -tallest small-smaller -smallestearly-earlier-earliestthirsty-thirstier-thirstiest1. 一般情况下加-er 或-est :2. 以字母e结尾的形容词,加-r 或- st4. 以 “辅音字母+y”结尾的双音节词,先改“y”为“i”,再加-er 或-est.big—bigger -biggest fat—fatter-fattest形容词比较级最高级规则nice –nicer-nicestsafe –safer -s