一．规则变化
1.直接加s。如：desk-desks
2.以s,x,sh,ch结尾的加es，如：box-boxes,bus-buses,match-matches
3.辅音字母加y结尾，变y为i,再加es。如：baby-babies。但前为元音字母时，直接加s，如：boy-boys（元音字母：a.e.i.o.u） 4.以o结尾的，一般来说，有生命的加es.(potato/potatoes,tomato/tomatoes), 无生命的加s(zoo/zoos,photo/photos)
5.以f或fe结尾的，变f/fe变为v，再加es（knife/knives.life/lives）有些直接加词尾s，如chief/chiefs首领 roof/roofs屋顶
二．不规则变化
man/men男人 woman/women女人 child/children小孩 tooth/teeth牙齿 foot/feet脚 person/people 人们 mouse/mice 老鼠
三．常见单数与复数同形的名词
sheep 绵羊 deer 鹿 fish 鱼 works 工厂 Chinese 中国人 Japanese 日本人 Swiss 瑞士人
其他
短语 a lot of=lots of many much a few. few a little Little 其后搭配 可数名词复数或不可数名词 可数名词复数 不可数名词 可数名词复数 可数名词复数 不可数名词 不可数名词 许多 许多 许多 少许；一点点 几乎没有 少量的 几乎没有 意思
练习
一、写出下列词的复数
1.book______ 2.bus ______ 3.orange _______ 4.baby______ 5.boy______ 6.my ______ 7.his______ 8.knife______ 9.watch______ 10.sheep______ 11.tooth_____ 12.leaf ______ 13.Chinese_________
二、选择正确的答案
( )1.—Are those ______?
---No, they aren’t. They’re _____. A. sheep ; cows B. sheep ; cow C. sheeps ; cow D. sheeps ; cows
( )2.Mum, I’m quite thirsty. Please give me ____.
A. two orange B. two bottles of orange
C. two bottles orange D. two bottles of oranges ( )3.___ room is on the 5th floor.
A. Lucy and Lily B. Lucy and Lily’s
C. Lucy’s and Lily D. Lucy’s and Lily’s ( )4.Jack and Tom are ____.
A. good friends B. good friend C. a good friend D. good a friend
( )5.Mrs. Green has two ____. They’re very bright.
A. childs B. child C. children’s D. children
( )6.I won’t go there with you, for I have a lot of ____ to do.
A. works B. job C. work D. working ( )7.How many ___ are there in the room?
A. boxes B. box C. boxs D. boxxes
( )8.Many ____ have been built in our city since 1987.
A. factorys B. factories C. factoryes D. factorys
( )9.There are lots of ___ in the basket on the table .
A. tomatos B. tomato C. tomatoes D. tomatoss ( )10.The cat caught two ___ last night.
A. mouses B. mice C. mouse D. mices
( )11.Jack went to have two ___ pulled out yesterday afternoon.
A. tooths B. tooth C. teeth D. toothes ( )12.In our school there are fifty-five ___.
A. women teachers B. woman teachers C. women teacher D. woman’s teacher ( )13.The three ___ will be put into prison.
A. thiefs B. thief C. thieves D. thiefs’
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