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Look,there is a farm!,pig,pigs,cow,cows,chick,chicks,bird,birds,horse,horses,sheep,sheep,pigs,birds,chicks,pigcowchickbirdhorsesheep,pigscowschicksbirdshorsessheep,Any more?,单数 复数,名词单复数变化规则1.一般情况+s：pigs，birds2.以s，sh，ch，x结尾的+es：classes，boxes3.辅音字母加y结尾，变y为i，+es：citycities，partyparties4.以f，fe结尾的变f，fe为v，+es：wolfwolves，kinfekinves5.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,
