形容词原级变比较级的变化规则:
1.small→smaller,clever→cleverer
2.large→larger, nice→nice
3.big→bigger, hot→hotter
4.easy→easier, heavy→heavier
busy→busier, happy→happier
5.beautiful→more beautiful
different→more different
6.特殊变化
good-better, bad-worse
many/much-more, little-less