15. Form a comparative and superlative degree of the following adjectives.
Big, heavy, short, dirty, clean, near, bad, famous, little, much,
clever, good expensive, cheap, important, pale, hot, beautiful, large,
practical, fat, early, pretty, happy, bright, dark, dry, flat, fresh, full,
quick, late, nice, rich, sad, thin, thick, wet.

Big-bigger-the biggest
heavy-heavier-the heaviest
short-shorter-the shortest
dirty-dirtier-the dirtiest
clear-cleaner-the cleanest
near-nearer-the nearest
bad-worse-the worst
famous-more famous-the most famous
little-less-the least
much-more-the most