1.单音节词和少数双音节词(如以y结尾的)在词尾加-er , -est.
如:small, smaller, smallest; great, greater, greatest; clever, cleverer, cleverest; quiet, quieter, quietest ; common, commoner, commonest; narrow, narrower, narrowest.
2、以e结尾的词加-r , -st .
如:larger, larger , largest ; simple, simpler , simplest ; polite, politer , politest; brave, braver, bravest; fine, finer, finest.
3、以“辅音字母+y”结尾的词,变y为i 再加-er , -est .
如:busy,busier, busiest; heavy,heavier, heaviest; happy,happier, happiest.
4、以一个辅音字母结尾的词,双写该辅音字母,再加-er, -est .(一个辅音字母结尾;重读闭音节)
如:big,bigger, biggest; thin,thinner, thinnest; hot,hotter, hottest.
双音节词,多音节词比较级和最高级在词前加more, most.
如:difficult, more difficult, most difficult, interesting, more interesting, most interesting; useful, more useful, most useful.
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