橄榄油的用处 英语的复数形式 红豆面包 责任目标(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: glass, boxes, brushes, matches. 广词语>沉思冥想
(空调安装合同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. 防丢器
(6)不规则名词：foot→feet, goo→gee, tooth→teeth, child→children, man→me n, woman→women, sheep→sheep, deer→deer, mou→mice.
极限值
(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→analys, basis→bas, crisis→cris, diagnosis→diagnos.( 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：manrvant→menrvants, 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
