英语单词中单数变复数的规则有:
1、一般情况下,直接加-s
如:book-books, bag-bags, cat-cats, bed-beds
2、以s. x. sh. ch结尾,加-es
如:bus-buses, box-boxes, brush-brushes, watch-watches
3、以“辅音字母+y”结尾,变y为i, 再加-es
如:family-families, strawberry-strawberries
4、以“f或fe”结尾,变f或fe为v, 再加-es
如:knife-knives
5、不规则名词复数:
man-men, woman-women, policeman-policemen
policewoman-policewomen, mouse-mice child-children foot-feet