Add -er or -est
tall -> taller -> tallest
long -> longer -> longest
Use more or most
beautiful -> more beautiful -> most beautiful
expensive -> more expensive -> most expensive
Change y to i, add -er or -est
happy -> happier -> happiest
easy -> easier -> easiest
Double the final consonant, add -er or -est
big -> bigger -> biggest
thin -> thinner -> thinnest
Just add -r or -st
large -> larger -> largest
late -> later -> latest
Must be memorized
good -> better -> best
bad -> worse -> worst
far -> farther/further -> farthest/furthest