Long
long / longer / the longest
Old
old / older / the oldest
Young
young / younger / the youngest
Short
short / shorter / the shortest
Good
good / better / the best
Happy
happy / happier / the happiest
Bad
bad / worse / the worst
Slow
slow / slower / the slowest
Thin
thin / thinner / the thinnest
Big
big / bigger / the biggest
Fast
fast / faster / the fastest
Heavy
heavy / heavier / the heaviest
Tall
tall / taller / the tallest
Fat
fat / fatter / the fattest
Small
small / smaller / the smallest