(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，bread
单复数同型：
Chinese,Japanese,sheep,deer,fish
我们来看下练习：
名词单数变复数练习
box_________pencil____________watch______
star__________door________flower________
window_________bag_________book________
dog____________cat__________tree_________ people_______girl_____________man_______
woman___________policeman______tooth__
doctor_________teacher__________child____
class________student__________eye________
ear_________photo_______map___________
desk__________half_________bird_________
wolf________family________sheep________
baby_______bus_________cloth________
key________tomato__________mouse_______
dish_________eraser_________apple________
