1、名詞由單數(shù)變復(fù)數(shù)的基本方法如下：

①在單數(shù)名詞詞尾加s。

如：map → maps,boy→ boys,horse→ horses, table→ tables.②s,o,x ,sh,ch結(jié)尾的詞加es.如：class→classes, box→boxes, hero→heroes, dish→dishes, bench→benches.[注]：少數(shù)以o結(jié)尾的詞,變復(fù)數(shù)時只加s。如：photo→photos, piano→pianos.③以輔音字母加y結(jié)尾的名詞,變y為i,再加es。如：family→families, city→cities, party→parties.④以f或fe結(jié)尾的名詞,變f或fe為v,再加es。如：shelf→shelves, wolf→wolves, life→lives, knife→knives.2、不規(guī)則變化：man→men, woman→women, sheep→sheep,tooth→teeth, fish→fish, child→children, ox→oxen, goose→geese不可數(shù)名詞一般沒有復(fù)數(shù)形式,說明其數(shù)量時,要用有關(guān)計量名詞。如：a bag of rice→two bags of rice, a piece of paper→three pieces of paper, a bottle of milk→five bottles of milk.