Small - smaller - the smallest (+er)
great - greater - the greatest (+er)
funny - funnier - the funniest (y->i +er)
dry - drier - the driest (y->i +er)
honest - honester - the honestest (+er)
dirty - dirtier - the dirtiest (y->i +er)
clean - cleaner - the cleanest (+er)
big - bigger - the biggest (g +er)
short - shorter - the shortest (+er)
strong - stronger - the strongest (+er)
bright - brighter - the brightest (+er)
nice - nicer - the nicest (+r)