一些词本身没有比较级和最高级形式，如：right, wrong, full, empty, round, complete, wooden, dead, daily等。

　　long-longer-longest

　　young-younger-youngest

　　old-older/elder-oldest/eldest

　　short-shorter-shortest

　　high-higher-highest

　　deep-deeper-deepest

　　small-smaller-smallest

　　big-bigger-biggest

　　tall-taller-tallest

　　loud-louder-loudest

　　low-lower-lowest

　　thin-thinner-thinnest

　　fat-fatter-fattest

　　great-greater-greatest

　　nice-nicer-nicest

　　happy-happier-happiest

　　heavy-heavier-heaviest

　　cheap-cheaper-cheapest

　　near-nearer-nearest

　　clean-cleaner-cleanest

　　few-fewer-fewest

　　late-later-latest

　　angry-angrier-angriest

　　busy-busier-busiest

　　lazy-lazier-laziest

　　hot-hotter-hottest

　　glad-gladder-gladdest

　　clear-clearer-clearest

　　strong-stronger-strongest

　　lucky-luckier-luckiest

　　interesting-more interesting-most interesting

　　difficult-more difficult-most difficult

　　expensive-more expensive-most expensive