1. big - bigger (than) - the biggest
2. small - smaller (than) - the smallest
3. old - older (than) - the oldest
4. expensive - more expensive (than) - the most expensive
5. beautiful - more beautiful (than) - the most beautiful
6. good - better (than) - the best
7. bad - worse (than) - the worst
8. happy - happier (than) - the happiest
9. easy - easier (than) - the easiest
10. slow - slower (than) - the slowest
11. important - more important (than) - the most important
12. nice - nicer (than) - the nicest
