1、单音节词末尾加-er(比较级),-est(最高级) 【例】 原级 比较级 最高级 great greater greatest small smaller smallest clean cleaner cleanest 2、单音节如以e结尾,只加-r(比较级),-st(最高级) 【例】 fine finer finest nice nicer nicest wide wider widest 3、闭音节单音节词如末尾只有一个辅音字母,须先双写这个辅音字母,再加-er(比较级),-est(最高级) 【例】 big bigger biggest hot hotter hottest red redder reddest 4、少数以-y,-er,ow,-ble结尾的双音节词,末尾加-er(比较级),-est(最高级).以-y结尾的词,如-y前是辅音字母,则变y为-i,再加-er和-est.以-e结尾的词只加-r和-st. 【例】 clever cleverer cleverest narrow narrower narrowest able abler ablest easy easier easiest 5、其它双音节和多音节词皆在前面加单词more和most. 【例】 careful more careful most careful difficult more difficult most difficult delicious more delicious most delicious 不规则变化 -原级 比较级 最高级 good/well better best bad worse worst many/much more most little less least far farther/further farthest/furthest