答:1)以s、x、sh、ch结尾的名词加es: glasses, boxes, brushes, matches.?2)以辅音字母加y结尾的名词，变y为i加es: cities, babies, enemies.?3)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.?4)以o结尾的名词，有些加es: Negroes, heroes, tomatoes, potatoes.其它加s: radio s, zoos, pianos, photos.?5)不规则名词：foot...
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