1. cheap - cheaper - the cheapest
2. far - farther - the farthest (further - the furthest)
3. hot - hotter - the hottest
4. cheerful - more cheerful - the most cheerful
5. pretty - prettier - the prettiest
6. red - redder - the reddest
7. noisy - noisier - the noisiest
8. terrible - more terrible - the most terrible
9. late - later - the latest (late - latter - the last)
10. bad - worse - the worst
11. difficult - more difficult - the most difficult
12. few - fewer - the fewest
13.old - older - the oldest (old - elder - the eldest)
14. sleepy - sleepier - the sleepiest
15. thin - thinner - the thinnest
