英语名词单数变复数的规则
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, tomatoes, potatoes.其它加s: radio s, zoos, pianos, photos.?
