narrow - narrower - the narrowest
dirty - dirtier - the dirtiest
wide - wider - the widest (или broad - broader - the broadest)
important - more important - the most important
small - smaller - the smallest
thin - thinner - the thinnest
hungry - hungrier - the hungriest
beautiful - more beautiful - the most beautiful
bad - worse - the worst
happy - happier - the happiest
strange - stranger - the strangest
comfortable - more comfortable - the most comfortable
angry - angrier - the angriest
loud - louder - the loudest
low - lower - the lowest
good - better - the best
straight - straighter - the straightest
young - younger - the yougest
expensive - more expensive - the most expensive