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 ]
Leaf——leaves
5．不规则名词复数：
man-men, woman-women, policeman-policemen, policewoman-policewomen,
child-children
foot-feet,.tooth-teeth
fish-fish, people-people, Chinese-Chinese, Japanese-Japanese
写出下列各词的复数
I _________him _________this ___________her ______
watch _______child _______photo ________diary ______
day________ foot________ book_______ dress ________
tooth_______ sheep ______box_______ strawberry _____
peach______ sandwich ______dish_______bus_______
man______ woman_______