名词复数规则
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, wife-wives
5．不规则名词复数：
man-men, woman-women, policeman-policemen, policewoman-policewomen,
mouse-mice, child-children, foot-feet, tooth-teeth, fish-fish, people-people
Chinese-Chinese, Japanese-Japanese
写出下列各词的复数
watch _______ child _______ photo _______ diary _______
day _______ foot_______ book_______ dress _______
tooth _______ sheep _______ box _______ strawberry _______
thief _______ yo-yo _______ peach _______ sandwich _______
man _______ woman _______ Chinese _______ bag _______