Преобразуйте прилагаьельные в сравниельную и превосходную форму. Пример: long-longer than-the longest. Вот прилагательные: fast, pretty, beautiful, ugly, thin, fashionable, tall, interesting, good, happy, sad, unusual.

Fast-faster than-the fastest

Pretty-prettier than-the prettiest (i сменяет y)

Beautiful-more beautiful then-most beautiful

Ugly-uglier than-the ugliest (i сменяет y)

Thin-thiner than-the thinest

Fashionable-more fashionable than-most fashionable

Tall-taller than-the tallest

Interesting-more interesting than-most interesting

Good-better than-the best (исключение)

Happy-happier than-the happiest (i-сменяет y)

Sad-sadder than-the saddest (d удваивается)

Unusual-more unusual-most unusual

Просто выучи правило и слова-исключения и все будет просто.