英语的复数形式                                                                  radio的复数形式(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, 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. 
(6)不规则名词:foot→feet, goose→geese, tooth→teeth, child→children, man→me n, woman→women, sheep→sheep, deer→deer, mouse→mice.
(7)某些外来词变复数:datum→data, medium→media, bacterium→bacteria, curriculum→curricula, criterion→criteria, phenomenon→phenomena. ( um/ on→a) analysis→analyses, basis→bases, crisis→crises, diagnosis→diagnoses.( is→es ) 
(8)复合名词变复数:以不可数名词结尾的复合名词无复数形式,如:homework. 
以man或woman为前缀的复合名词变复数,前后两个名词都变复数,如:manservant→menservants, woman student women students. 
其它复合名词变复数:grown up→grown ups, brother in law→brothers in law, stand by→stands by. 
(9)复合形容词做定语时,其中的名词保持单数:a six year old boy,a two hundred page book

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