Hot
hotter - the hottest
Large
larger - the largest
Thin
thinner - the thinnest
Cold
colder - the coldest
Popular
more popular - the most popular
Fast
faster - the fastest
Happy
happier - the happiest
Dangerous
more dangerous - the most dangerous
Strong
stronger - the strongest
Easy
easier - the easiest
New
newer - the newest
Careful
more careful - the most careful
Short
shorter - the shortest
Heavy
heavier - the heaviest
Old
older - the oldest
Fat
fatter - the fattest
Boring
more boring - the most boring
Young
younger - the youngest
Nice
nicer - the nicest
Funny
funnier - the funniest
Pretty
prettier - the prettiest
Good
better - the best
Expensive
more expensive - the most expensive
Modern
more modern - the most modern
Difficult
more difficult - the most difficult
Cheap
cheaper - the cheapest
Long
longer - the longest
Beautiful
more beautiful - the most beautiful
Dirty
dirtier - the dirtiest
Bad
worse - the worst