Long - longer -the longest
short - shorter - the shortest
clever - cleverer - the cleverest
tasty - tastier - the tastiest
funny - funnier - the funniest
big - bigger - the biggest
thin - thinner - the thinnest
young - younger - the youngest
red - redder - the reddest
white - whiter - the whitest
black - blacker - the blackest
new - newer - the newest
fat - fatter - the fattest
slim - slimmer - the slimmest
nice - nicer - the nicest