1、比较级和最高级的变化分为规则变化和不规则变化，其中规则变化， 一般单音节词，末尾加er或est，如tall-taller, tallest，
2、以辅音字母+y结尾的双音节词改y为i，并加er或est，如busy-busier-busiest, he is busier than yesterday，他比昨天要忙
3、以不发音的e结尾的单音节词和当数以le结尾的双音节词只加r,st，如nice-nicer-nicest，Mary is the nicest woman in the town
4、以一个辅音字母结尾的闭音节单间节词，双写结尾的辅音字母，再加er或est，如big-bigger-biggest，如the apple in the middle is the biggest
5、其他双音节词和多音节词，在前面加more, most，如important-more important-most inportant, Study English is the most important thing
6、不规则变化的单词有good/well, bad, many, little,far等，比如far-farther-farthest, bad-worse-worst, many-more-most, good-better-best等等
