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Look, there is a farm!,pig,pigs,cow,cows,chick,chicks,bird,birds,horse,horses,sheep,sheep,pigs,birds,chicks,pig cow chick bird horse sheep,pigs cows chicks birds horses sheep,Any more?,单数 复数,名词单复数变化规则 1.一般情况+s:pigs,birds 2.以s,sh,ch,x结尾的+es: classes, boxes 3.辅音字母加y结尾,变y为i,+es: citycities, partyparties 4.以f,fe结尾的变f, fe为v,+es: wolfwolves,kinfekinves 5.以o结尾+es只有以下词: heroes, tomatoes, potatoes, Negroes(黑人), zeroes/zeros,sheep,pig,cow,chick,bird,horse,a e b c q w e r t h y u c f I o a p s l z s x k i j u h y g t f d o z q x w n e m r a d f g h j k l,