1、直接加-s.
如:tree-trees树, desk-desks桌 card-cards, parent-parents,
2、以s,x, ch, sh 结尾的加es.
如:bus-buses, box-boxes, watch-watches 手表, brush-brushes 刷子, glass-glasses.
3、以辅音字母+ y结尾的,改y为i再加es.
如:country-countries 国家、乡村, city-cities 城市, baby-babies, family-families,
特例::boy-boys, monkey-monkeys, toy-toys, play-plays(剧本)
4、以f或者fe 结尾的词,改f为v,再加es.
如:knife-knives刀, leaf-leaves 树叶, wife 妻子-wives.
5、以O结尾的单词,有生命的+-es,无生命+s.
如:Hero-heroes 英雄, Negro-negroes 黑人, potato-potatoes 土豆, tomato-tomatoes 西红柿
名词单数变复数,直接加-s占多数;
s,x,zchsh来结尾,直接加上-es;
词尾是f或fe,加-s之前先变ve;
辅母+y在词尾,把y变i再加-es;
词尾字母若是o,常用三个已足够;
要加-es请记好,hero, tomato, potato。