三年级名词单数变复数规则1.一般情况下,直接加s如:apple-apples pig-pigs book-books2.以s、sh、ch、x结尾的名词,加es如:bus-buses(公车) class-classes(班级) fish-fishes(此时的fish当“鱼的种类”讲)watch-watches(手表) box-boxes(盒子) fox-foxes(狐狸)3.以元音字母+y结尾的名词,直接加s如:boy-boys(男孩) toy-toys(玩具)4.以辅音字母+y结尾的名词,去y改ies如:family-families(家庭) strawberry-strawberries(草莓)5.以f或fe结尾的名词,去f或fe改ves如:wife-wives knife-knives wolf-wolves(这三个词的记忆口诀-“妻子”拿着“小刀”杀了“狼”)6.以”o结尾的名词:(1)有生命的,加es,如:potato-potatoes tomato-t