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可数名词: 名词的单数形式:auseful book,auniversity, a UFO, a piece of advice1.复数形式的构成方法—规则变化sandwich--sandwiches, human--mans, walkman--walkmans, German—Germans, boy—boys, toy—toys, key—keys, monkey—monkeys radio–radios zoo–zoos, hero-heroes potato-potatoes tomato-tomatoes shelf – shelves knife – knives2.特殊变化的单词(1)单复数同形Chinese–Chinese Japanese–Japanese sheep– sheep deer—deer (2)变元音字母oo为ee tooth – teeth foot – feet (3).变man为 men woman – women policeman – policemen Frenchman – Frenchmen 请区别：German(德国人) – Germans walkman-walkmans human-humans | 
