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, proof s, chiefs.? 5)以o结尾的名词，有些加es: Negroes, heroes, tomatoe...
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