Образуйте сравнительную и превосходную степень прилагательных kind, mean, rude, messy, polite, sad, nice, generous, wealthy, hot, polluted, noisy, busy, bad, good, simple, stupid, crowded, dry, friendly, wet, gray, large, big, happy, pretty, young, difficult, little, careful, serious.

kind-kinder-kindest, mean-meaner-meanest, rude-ruder-rudest, messy-messier-messiest, polite-politer-politest,  sad-sadder-saddest, nice-nicer-nicest,  generous-more generous - most generous, wealthy- wealthier-wealthiest, hot-hotter-hottest, polluted(это глагол "загрязненный", а степени сравнения только у прилагательных), noisy-noisier-noisiest,  busy- busier-busiest, bad-worse-worst(исключение), good-better-best(тоже исключение), simple- simpler-simplest, stupid-stupider-stupidest, crowded (глагол "переполненный", к глаголам степени сравнения не используются) ,dry-drier-driest, friendly- friendlier- friendliest,  wet- wetter-wettest,  gray- grayer-grayest, large-larger-largest, big- bigger- biggest, happy- happier-happiest, pretty- prettier-prettiest,  young- younger-youngest,

difficult- more difficult-most difficult, little-littler-littlest, careful-more careful - most careful, serious-more serious/seriouser-most serious/seriousest