写出比较级与最高级

big,bigger,biggest
fat,fatter,fattest
hot,hotter,hottest
red,redder,reddest
thin,thinner,thinnest
wet,wetter,wettest
beautiful,more beautiful,most beautiful
expensive,more expensive,most expensive
important,more important,most important
interesting,more interesting,most interesting
popular,more popular,most popular
useful,more useful,most useful
good,better,best
well,better,best
bad,worse,worst
ill,worse,worst
many,more,most
much,more,most
little,less,least
far,farther/further,farthest/furthest

1 全部双写最后一个字母+er
2 more+单词
3 better worse more more better worse less/littler/lesser farther/further