Write the comparatives and superlatives of the given adjectives.
small
tall
old
old
-fashioned
messy
light
clean
colourfu
l comfortable
large
modern
bad
thin
fat
good

Sure, I can help you with that!

Comparatives and superlatives are used to compare and rank things based on their qualities. To form the comparatives, we usually add "-er" to the end of the adjective. To form the superlatives, we usually add "-est" to the end of the adjective.

Here are the comparatives and superlatives of the given adjectives:

1. small - smaller - the smallest
Explanation: "Small" becomes "smaller" to compare it with something else. And it becomes "the smallest" when comparing it with two or more things.

2. tall - taller - the tallest
Explanation: "Tall" becomes "taller" to compare it with something else. And it becomes "the tallest" when comparing it with two or more things.

3. old - older - the oldest
Explanation: "Old" becomes "older" to compare it with something else. And it becomes "the oldest" when comparing it with two or more things.

4. -fashioned - more old-fashioned - the most old-fashioned
Explanation: "Old-fashioned" is an irregular adjective, so we use "more" before it to form the comparative, and "the most" before it to form the superlative.

5. messy - messier - the messiest
Explanation: "Messy" becomes "messier" to compare it with something else. And it becomes "the messiest" when comparing it with two or more things.

6. light - lighter - the lightest
Explanation: "Light" becomes "lighter" to compare it with something else. And it becomes "the lightest" when comparing it with two or more things.

7. clean - cleaner - the cleanest
Explanation: "Clean" becomes "cleaner" to compare it with something else. And it becomes "the cleanest" when comparing it with two or more things.

8. colourful - more colourful - the most colourful
Explanation: "Colourful" is an irregular adjective, so we use "more" before it to form the comparative, and "the most" before it to form the superlative.

9. comfortable - more comfortable - the most comfortable
Explanation: "Comfortable" is an irregular adjective, so we use "more" before it to form the comparative, and "the most" before it to form the superlative.

10. large - larger - the largest
Explanation: "Large" becomes "larger" to compare it with something else. And it becomes "the largest" when comparing it with two or more things.

11. modern - more modern - the most modern
Explanation: "Modern" is an irregular adjective, so we use "more" before it to form the comparative, and "the most" before it to form the superlative.

12. bad - worse - the worst
Explanation: "Bad" becomes "worse" to compare it with something else. And it becomes "the worst" when comparing it with two or more things.

13. thin - thinner - the thinnest
Explanation: "Thin" becomes "thinner" to compare it with something else. And it becomes "the thinnest" when comparing it with two or more things.

14. fat - fatter - the fattest
Explanation: "Fat" becomes "fatter" to compare it with something else. And it becomes "the fattest" when comparing it with two or more things.

15. good - better - the best
Explanation: "Good" becomes "better" to compare it with something else. And it becomes "the best" when comparing it with two or more things.

I hope this helps! Let me know if you have any more questions.