1.一般情况下,直接加-s,如:book-books,bag-bags,cat-cats,bed-beds
2.以结尾,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-knivesLeaf——leaves
man-men,woman-women,policeman-policemen,policewoman-policewomen,
child-childrenfoot-feet,tooth-teethfish-fish,people-people,Chinese-Chinese,Japanese-Japanese