Сравнительная степень прилагательных образуется с помощью суффиксов -er (для односложных прилагательных) или слова more (для многосложных).
Превосходная степень прилагательных образуется с помощью суффиксов -est (для односложных прилагательных) или слов most (для многосложных).
Вот примеры:
* Hot - hotter - the hottest
* Long - longer - the longest
* Short - shorter - the shortest
* Clever - cleverer - the cleverest
* Silly - sillier - the silliest
* Great - greater - the greatest
* Red - redder - the reddest
* Black - blacker - the blackest
* White - whiter - the whitest
* Thin - thinner - the thinnest
* Thick - thicker - the thickest
* Fat - fatter - the fattest
* Nice - nicer - the nicest
* Warm - warmer - the warmest
* Cold - colder - the coldest
* Merry - merrier - the merriest
* Small - smaller - the smallest
* Tall - taller - the tallest
* High - higher - the highest
* Weak - weaker - the weakest
* Strong - stronger - the strongest
* Heavy - heavier - the heaviest
* Light - lighter - the lightest
* Green - greener - the greenest
* Dry - drier - the driest
* Clean - cleaner - the cleanest
* Dirty - dirtier - the dirtiest
* Wide - wider - the widest
* Beautiful - more beautiful - the most beautiful
* Little - less - the least
* Active - more active - the most active
* Neat - neater - the neatest
* High - higher - the highest
* Bad - worse - the worst
* Obvious - more obvious - the most obvious
* Rude - ruder - the rudest
* Many - more - the most
* Big - bigger - the biggest
* Sensitive - more sensitive - the most sensitive
* Light - lighter - the lightest
* Amazing - more amazing - the most amazing
* Far - farther/further - the farthest/furthest
* Good - better - the best
* Difficult - more difficult - the most difficult