2)以s、x、sh、ch结尾的名词加es:glasses,boxes,brushes,matches.\x0d3)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.\x0d5)以o结尾的名词,有些加es:Negroes,heroes,tomatoes,potatoes.其它加s:radio s,zoos,pianos,photos.\x0d6)不规则名词：foot→feet,goose→geese,tooth→teeth,child→children,man→me n,woman→women,sheep→sheep,deer→deer,mouse→mice.\x0d7)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 )\x0d8)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.\x0d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.\x0d其它复合名词变复数：grown up→grown ups,brother in law→brothers in law,stand by→stands by.\x0d9)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