可數名詞變形形式：
1)單數名詞加s: students, apples, bags, trees, books, brothers.
2)以s、x、sh、ch結尾的名詞加es: glasses, boxes, brushes, matches.
3)以輔音字母加y結尾的名詞，變y為i加es: cities, babies, enemies.
4)以f或fe結尾的名詞，多數變f或fe為v加es: wives, knives.但有些詞只加s: roofs, proof s, chiefs.
5)以o結尾的名詞，有些加es: Negroes, heroes, tomatoes, potatoes.其它加s: radio s, zoos, pianos, photos. 以o結尾的名詞，若該名詞表示有生命，則在o后面加es.
6)不規則名詞：foot→feet, goose→geese, tooth→teeth, child→children, man→me n, woman→women, sheep→sheep, deer→deer, mouse→mice.