cleaner cleanest
dirtier dirtiest
bigger biggest
smaller smallest
iller illest
less least
harder hardest
happier happiest
farther/further
farthest/furthest
better best
slower slowest
easier easiest
newer newest
younger youngest
ruder rudest
quieter quietest
drier driest
cheaper cheapest
urlier ugliest
busier busiest
older/elder oldest/eldest
noisier noisiest
hotter hottest
colder coldest
faster fastest
wetter wettest
earlier earliest
brighter brightest
more boring most boring
more careful most careful
more puietly most puietly
more expensive most expensive
more difficult most difficult
more interesting most interesting
more beautiful most beautiful