Pep六下比较级整理：一般情况加“er”：talltaller longlonger strongstronger fastfaster kindkinder brightbrighter warmwarmer coldcolder oldolder smallsmaller shortshorter倒数第二个字母是元音字母，双写尾字母加“er”：thinthinnerbigbigger sadsadder hothotter wetwetter fatfatter 尾字母是“y”，变“y”为“i”加“er”：heavyheavierangryangrier sunnysunnier funnyfunnierhappyhappier windywindier thirstythirstierdirtydirtier prettyprettier healthyhealthier尾字母是“e”，直接加“r”： finefiner largelarger