单词单数变复数规则 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. 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. crisis→crises, (um/on→a)analysis→analyses, 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：grownup→grownups, brotherinlaw→brothersinlaw, standby→standsby. 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 basis→bases, 本文来源：https://www.wddqw.com/doc/e57d636c763231126fdb1112.html