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名词单数变复数口诀•(一)规则变化•名词单数变复数，直接加-s占多数；•book-books;pen-pens;apple-apples•s,x,z,ch,sh来结尾，直接加上-es；•dress-dresses;box-boxes;buzz-buzzes;watch-watches;brush-brushes•词尾是f或fe，加-s之前先变ve；•leaf-leaves;wife-wives;knife-knives•辅音+y在词尾，把y变i再加-es；•study-studies;baby-babies;city-cities•元音+y在词尾,只加s就足够•boy–boys;day–days;monkey–monkeys•词尾字母若是o，常用三个已足够，要加-es请记好，hero,tomato,potato。•美国黑人和英雄爱吃土豆和西红柿。•negro-negroes;hero-heroes;potato-potatoes;tomato-tomatoes•其余o结尾的词加s,photo-photos;piano-pianos•(二)不规则变化•男人女人a变e，鹅足牙oo变ee；•man-men;woman-women;goose-geese;foot-feet;tooth-teeth•老鼠虱子也好记，ous变ic；•mouse-mice;louse-lice•孩子加上ren，鱼鹿绵羊不用变•child-children;fish;deer;sheep•this---these(这些)•that--those(那些)