可数名词单数变复数的规则 1. 一般直接s. Eg：boy-boys;
color-colors.
2. 以s, x, ch, sh 结尾的加es. Eg:
watch-watches; dress-dresses.
3. 以o结尾的通常加s，除了potato
和tomato要加es.
4. 以辅音字母加y结尾的，变y为
I,再加
es.Eg:baby-babies;
family-families
5. 以f/fe结尾的，变f/fe为v,再加
es. eg: housewife-housewives
6. 特殊变化的有man-men; woman-women;
policeman-policemen;policewoman-policewomen;
postman-postmen; milkman-milkmen
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