一、可数名词都有单数和复数之分。A:规则的可数名词的复数变化规则：1.一般情况加s：book--booksmouth---mouthshouse---housesgirl---girls2.以s、x、sh、ch结尾的加es：class---classesbox----boxesmatch----matchesbrush—brushes注：“stomach”（胃），“monarch”（君主）等的复数是词尾加“-s”而不是加“-es”，因为这些词的词尾“ch”的发音是[-k]。3.辅音字母+y结尾的变y为i加es：city---citiescountry----countriesparty----partiesfactory----factoriesdictionary—dictionariesstrawberry—strawberries4.以o结尾的词+es的只有以下词：Negroherotomatopotato特殊：zero--zeroes/zerosHeroesandNegroeslikeeatingpotatoesandtomatoes.以o结尾并且词尾有两个元音字母+sradios,zoos,bamboos,(pianos,kilosphotos)5.以f，fe结尾的变f或fe为v+es：thiefwifelifeknifewolfhalfleafshelfThethief’swifekilledthreewolveswithsomeleavesandknivesinhalfofherlife.B:不规则的可数名词的变化规则：1.man—men,woman—women,tooth—teeth,foot—feet,goose—geesechild—children,mouse—mice,2.单复数相同:sheep,deer,Chinese,JapaneseSwiss.3.以man,woman修饰名词构成合成词时,两个词都变化.manservant—menservants.(boy/girlstudents)womandoctor—womendoctors.
