cheap: cheaper, cheapest
high: higher, highest
safe: safer, safest
hot: hotter, hottest
higher,highest
taller,tallest shorter,shortest
newer.newest
quicker,quickest
finer,finest
later,latest
fatter,fattest
thinner,thinnest
bigger,biggest
easier,easiest
earlier,earliest
funnier,funniest
thirstier,thirstiest
healthier,healthiest
more beautiful, the most beautiful
more interesting,the most interesting
more outgoing,the most outgoing
more famous,the most famous
more exciting,the most exciting
不规则：
bad: worse, worst
good: better, best