3、),则一般加es;②以o结尾的单词除了两人(negro,hero)两菜(tomato,potato)加es外,其余一般加s;③以f或fe结尾的单词一般是把f,fe变为ve再加s;④英语中还有些单词没有规则,需要特殊记忆,如child—children,mouse—mice,deer—deer,sheep—sheep,Chinese—Chinese,ox—oxen,man—men,woman—women,foot—feet,tooth—teeth。其他口诀:以-f(e)结尾变复数只加s的单词:gulf roof chi