Old
Older
Pretty
Prettier
Small
Smaller
Cold
Colder
Clean
Cleaner
Happy
Happier
Easy
Easier
Bad
Worse
Ugly
Uglier
Long
Longer
Dangerous
More dangerous
Cheap
Cheaper
Young
Younger
Good
Better
Tall
Taller
Interesting
More interesting
Big
Bigger
Expensive
More expensive
Short
Shorter
Slow
Slower
Difficult
More difficult
Hot
Hotter
Dirty
Dirtier
Fast
Faster