Для образования сравнительной и превосходной степени прилагательных в английском языке используются суффиксы -er/-est для коротких прилагательных и слова more/most для длинных прилагательных. Также существуют исключения.
- big - bigger - biggest
- heavy - heavier - heaviest
- short - shorter - shortest
- dirty - dirtier - dirtiest
- clean - cleaner - cleanest
- near - nearer - nearest
- bad - worse - worst (исключение)
- famous - more famous - most famous
- little - less - least (исключение)
- much - more - most (исключение)
- clever - cleverer - cleverest
- good - better - best (исключение)
- expensive - more expensive - most expensive
- cheap - cheaper - cheapest
- important - more important - most important
- pale - paler - palest
- hot - hotter - hottest
- beautiful - more beautiful - most beautiful
- large - larger - largest
- practical - more practical - most practical
- fat - fatter - fattest
- early - earlier - earliest
- pretty - prettier - prettiest
- happy - happier - happiest
- bright - brighter - brightest
- dark - darker - darkest
- dry - drier - driest
- flat - flatter - flattest
- fresh - fresher - freshest
- full - fuller - fullest
- quick - quicker - quickest
- late - later - latest
- nice - nicer - nicest
- rich - richer - richest
- sad - sadder - saddest
- thin - thinner - thinnest
- thick - thicker - thickest
- wet - wetter - wettest
- weak - weaker - weakest
- early - earlier - earliest
- funny - funnier - funniest
- easy - easier - easiest
- lazy - lazier - laziest
- ugly - uglier - ugliest
- comfortable - more comfortable - most comfortable
- quiet - quieter - quietest
- far - farther/further - farthest/furthest (исключение)
Ответ: список сравнительных и превосходных степеней прилагательных выше.