(一)名词单复数
1.一般情况，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
tooth-teeth
fish-fish
people-people
Chinese-Chinese
Japanese-Japanese
不可数名词的复数就是原型：paper, juice, water, milk, rice, tea
