short-shorter nice-nicer funny-funnier fat-fatter cold-colder thin-thinner happy-happier small-smaller young-younger wet-wetter wash-washed play-played clean-cleaned visit-visited go-went do-did read-read fly-flew study-studied is-was wear-wears dig-digs hurt-hurts go-goes do-does have-has climb-climbs catch-catches watch-watches wash-washes cat-cats swim-swimming sing-singing buy-buying get-getting take-taking run-running fly-flying drink-drinking write-writing talk-talking drive-driving