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

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