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