Ответ:

sad — sadder; pretty — prettier; easy — easier; fast — faster; happy — happier; hot — hotter; friendly — friendlier; old — older; loud — louder; high — higher.

slow — slower; kind — kinder; fat — fatter; lazy — lazier; big — bigger; angry — angrier; funny — funnier; quiet — quieter; thin — thinner; tall — taller.