hero-heroes
radio-radios
以-f或-fe结尾的名词把-f或-fe变成-ves
-ves读作/vz/
knife-knives
leaf-leaves
(3)可数名词单数变复数的不规则形式：
单复数同形
Chinese-Chinese, Japanese- Japanese
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七年级英语上册Unit 4教案