Cтепени сравнения прилагательных
Dirty-dirtier-the dirtiest, old-older-the oldest, little-less-least, nice-nicer-nicest, wonderful-more wonderful-the most wonderful , hot-hotter-the hottest, short-shorter-the shortest, interesting-more interesting-the most interesting, bad-worse-the worst, silken-silkier-the silkiest