不规则名词复数

man=men
woman=women

man - men woman - women
foot - feet tooth - teeth
mouse - nice ox - oxen
sheep - sheep dear - dear
fish - fish goose - geese
child -children people - people
dear - dear deer - deer
datum - data medium - media
bacterium - bacteria curriculum - curricula
criterion - criteria phenomenon - phenomena
analysis - analyses basis - bases
crisis - crises diagnosis - diagnoses
patriarch - patriarch accordance - accordance
homework - homework Chinese - Chinese
Japanese - Japanese four jin - four jin
yuan - yuan police - police
foot-feet 脚
goose-geese 鹅
tooth-teeth 牙齿
mouse-mice 老鼠
man-men 男人
woman-women 女人
policeman-policemen 警察
但是：German-Germans 德国人
2. 有些名词的单复数形式相同。如：
sheep-sheep 绵羊
deer-deer 鹿
Chinese-Chinese 中国人
Japanese-Japanese 日本人
3. 有的名词在词尾加-en构成复数。如：
child-children 孩