可数名词变复数的几种形式:
1) 单数名词加s: students, apples, bags, trees, books, brothers.
2) 以s、x、sh、ch结尾的名词加es: glasses, boxes, brushes, matches.
3) 以辅音字母加y结尾的名词,变y为i加es: cities, babies, enemies.
4) 以f或fe结尾的名词,多数变f为v加es: wives, knives.但有些词只加s: roofs,proofs, chiefs.
5) 以o结尾的名词,有些加es: Negroes, heroes, tomatoes, potatoes. 其它加s: radio s, zoos, pianos, photos.
6) 不规则名词:foot→feet, goose→geese, tooth→teeth, child→children, man→men, woman→women, mouse→mice.
7) 单复数同形的名词:sheep,fish,dee.
注意:fish表示种类时,也用fishes这样的形式。
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