1. long 2. short 3. clever 4. tasty 5. funny 6. big 7. thin 8. young 9. red 10. white 11. black 12. new 13. fat 14. slim 15. nice степени сравнения всех слов .

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