Able-abler-the ablest
Bright- brighter-the brightest
Cool-cooler-the coolest
Cold-colder-the coldest
Dark-darker-the darkest
Careful- more careful- the most careful
Clever- cleverer/more clever- the cleverest/the most clever
Big-bigger-the biggest
Early- earlier- the earliest
Bad- worse- the worst
High- higher- the highest
Hot- hotter- the hottest
Funny- funnier- the funniest
Famous- more famous- the most famous
Important- more important- the most important
Serious- more serious- the most serious
Pretty- prettier- the prettiest
Busy- busier- the busiest
Wise- wiser- the wisest
Comfortable- more comfortable- the most comfortable
Interesting l- more interesting- the mist interesting
Difficult- more difficult- the most difficult
Small- smaller- the smallest
Happy- happier- the happiest
Polite- more polite- the most polite
Delicious- more delicious- the most delicious
Tasty- tastier- the tastiest
Cheap- cheaper- the cheapest
Expensive- more expensive- the most expensive
Weird- weirder- the weirdest