把下列名词变为复数

问题描述:

把下列名词变为复数
watch tomato potato plane fish deer hero radio piano family child mouse bus foot tooth Chinese German American knife wife Englishman

watches
tomatoes
potatoes
planes
fish
deer
heroes
radios
pianos
families
children
mice
buses
feet
teeth
Chinese
Germans
Americans
knives
wives
Englishmen.