可数名词的复数变化
可数名词一般有单数和复数两种形式，名词由单数变成复数的变化分为规则变化和不规则变化两个大类。
1.名词复数的规则变化：
⑴绝大多数名词直接在词尾加s变成复数，如：cup—cups, bathroom-bathrooms
⑵以s, x, ch, sh结尾的名词变复数要加es，如：class（班级）—classes, box（盒子）—boxes, match（火柴）—matches, brush（刷子）—brushes
⑶以f或fe结尾的名词变复数时，去f或fe再加ves。
f、fe结尾的顺口溜：妻子持刀去宰狼，小偷吓得发了慌；躲在架后保己命，半片树叶遮月光。
按：顺口溜中的黑体字是中学阶段学过的九个以—f(e)结尾的名词：wife(妻子)，knife(小刀)，wolf(狼)，thief(小偷)，shelf(架子)，self(自己)，life(生命)，half(一半)，leaf(树叶)。
这九个词变复数时，都是改-f(e)为ve再加-s。
注意:以f结尾的名词，一般把把f改为ves，但也有特殊情况是直接加-s的，如gulf（海湾）, roof（屋顶）, chief（首领）, serf（农仆）, belief（信仰）, proof（证据）, handkerchief （手帕）。
编成口诀联想：海湾边、屋顶上，首领农仆相望；谁说他们无信仰，证据定在手帕上。
⑷以y结尾的名词变复数时视以下两种情况而变：
①元音+y：直接+s ,如：boy—boys, toy—toys, day--days
②辅音+y：变y为i，再+es ，如：study(书房)—studies, city(城市)—cities, party（晚会）-parties
⑸以o结尾的名词变复数时视以下三种情况而变：
O结尾的名词顺口溜
1）有生命的以o结尾的名词变复数时，词尾加es，凡无生命的以o结尾的名词变复数时，词尾加s。
有生命：potato（土豆）-potatoes, tomato（西红杮）-tomatoes, hero（英雄）-heroes, Negro （黑人）--Negroes
如无生命：zoo-zoos, radio-radios, photo-photos, piano-pianos, zero-zeros, bamboo（竹竿）--bamboos, tobacco（烟丝）--tobaccos
2）两人两菜一水果。
（+es）
小学-中学课本中以o结尾的名词构成复数时，加es的只有Negro（黑人），hero（英雄），potato （土豆），tomato（西红杮），mango（芒果）这就是“两人两菜一水果”。
3）其余以o结尾的名词变复数时均加s。
图景：你在“zoo”里，看见一要“bamboo”，上面挂着一张“photo”，所照的是一架“piano”，上面放着一台“radio”。
zoo-zoos , bamboo-bamboos, photo-photos piano-pianos, radio-radios.
2.名词复数的不规则变化：
3. There are four and two in the group.
A. Japanese,Germen B Japaneses,Germen C. Japanese,German C.Japanese, Germans
4. That’s art book.A. an B. a C. the D are
5. The boys have got already（已经）.
A. two bread
B. two breads
C. two pieces of bread
D. two piece of bread
6. The old man wants .A. six boxes of apples B. six boxes of apple
C. six box of apples
D. six boxs of apples
7. There some in the river.A. is ,fish B. are, fishs C. is, fishs D. are ,fish
8. There two in the box.A. is watch B. are watches C. are watch D. is watches
9. We should clean twice a day.A .our tooth B. our tooths C.teeth D.our teeth
10.They come from different ______A. country B.countries C. a country D. countrys
11. How many _____do you see in the picture?A.tomatos B.tomatoes C.tomato D.the tomato
12. They are______.
A . woman teachers B. women teachers C. women teacher D. woman teacher
13. Would you like _______ ,please?
A. two glass of water
B. two glasses of water
C. two glass of waters
D. two glasses of waters
14. Most of ______ live in _______.
A. Germans, German
B. German, Germen
C. Germen, Germany
D. Germans, Germany
15. There are some ______ in these _______.A.knifes…pencil-boxes B.knives…pencils-box C.knives…pencil-box D.knives…pencils-boxes
16. ______ like ______ by air.
A. Greens, travelling
B. The Green, traveling
C. The Greens, travel
D. The Greens, traveling
A. the people
B. people
C. peoples
D. the peoples 三）.填入所给名词的正确形式
1. I have two_____ (knife)
2. There are many _____ here. (box)
3. There are many _____ on the road. (bus)
4. A few _____ are drawing on the wall. (boy)
5. The _______ are playing football now. (child)。