2.fast-faster-the fastest. 3. clever-cleverer-the cleverest. 4. big-bigger-the biggest. 5. thin- thinner- the thinnest. 6.hot-hotter-the hottest. 7. happy-happyer- the happiest. 8. pretty-prettier-the prettiest. 9. heavy-heavier-the heaviest. 10. good-better-the best.