tall-taller -the tallest

close-closer-the closest

far farther the farthest

big bigger the biggest

happy happier the happiest

bad worse the worst

good better the best

pretty pretier the prettiest

angry more angry the most angry

angrily more angrily the most angrily

short shorter the shortest

fast faster the fastest

intelligent more intelligent the most intelligent

curious more curious the most curious

boring more boring the most boring

terrible more terrible the most terrible

curly curlier the curliest

beautiful more beautiful the most beautiful

ugly uglier the ugliest

tiny tinier the tiniest

slow slower the slowest

slowly more slowly the most slowly

clean cleaner the cleanest

dirty dirtier the dirtiest

thin thiner the thinest

slender more slender the most slender