3

approximately, chiefly, similarly, actively, badly, brightly

4

long - longer - the longest

big - bigger - the biggest

bad - worse - the worst

bright - brighter - the brightest

important - more important - the most important

far - farther/further  - farthest/furthest

difficult - more difficult - the most difficult

good - better - the best

many - more - the most

little - less - the least