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（3)以字母f或fe结尾的词，变f或fe为v再加es.
knife---knives wife---wives leaf---leaves
life---lives wolf---wolves shelf---shelves
(4) 以辅音字母加y结尾的词，先变y为i再加es.
baby---babies story---stories city---cities
(5)以元音字母加y结尾的词，加s.
boy---boys toy---toys
key---keys monkey--- monkeys
(6) 以辅音字母加o结尾的词，若表示有生命的 加es,（英雄hero---heroes爱吃西红柿tomato---tomatoes和土豆potato---potatoes ).若表示无生命的加s. (zoo---zoos radio---radios piano---pianos).
1.变a为e ：man---men woman---women
特例：German---Germans human---humans
2.变oo为ee：tooth---teeth foot---feet
goose---geese
特例：boot---boots
3.单复同形：sheep deer Chinese Japanese
4.特殊形式：mouse---mice child---children
1. I need some ＿＿＿＿ (tomato) to make salad.
2. The＿＿＿ (leaf) turn yellow in autumn.
3. These ＿＿＿(child) are flying kites in the park.
4. Husbands should share the housework with their ＿＿＿(wife) .
5. We should brush ＿＿＿(tooth) three times a day.
6. Don’t move these ＿＿＿(box). They are dangerous.
tomatoes
leaves
children
wives
teeth
boxes
物质名词
1.液体：water milk juice tea soup coffee