英语名词单数变复数的规则一、绝大多数的可数名词的复数形式，是在该词末尾加上后辍-s。
读音变化：结尾是清辅音读[s]，结尾是浊辅音或元音读[z]。
例：friend→friends; cat→cats; style→styles; sport→sports; piece→pieces二、凡是以s、z、x、ch、sh结尾的词，在该词末尾加上后辍-es构成复数。
读音变化：统一加读[iz]。
例：bus→buses; quiz→quizzes; fox→foxes; match→matches; flash→flashes三、以辅音字母+y结尾的名词，将y改变为i，再加-es。
读音变化：加读[z]。
例：candy→candies; daisy→daisies; fairy→fairies; lady→ladies; story→stories四、以-o结尾的名词，如果不是外来词或缩写，就加-es，否则加-s构成复数。
读音变化：加读[z]。
例：tomato→tomatoes; potato→potatoes; torpedo→torpedoes; bingo→bingoes反例：silo→silos; piano→pianos（外来词）; photo→photos; macro→macros（缩写词）五、以-f或-fe结尾的名词，多为将-f或-fe改变为-ves，但有例外。
读音变化：尾音[f]改读[vz]。
例：knife→knives; life→lives; leaf→leaves; staff→staves; scarf→scarves反例：roof→roofs六、以-us结尾的名词（多为外来词），通常将-us改变为-i构成复数。
读音变化：尾音[Es]改读[ai]，其中[kEs]要改读为[sai]，[gEs]要改读为[dVai]。
例：fungus→fungi; abacus→abaci; focus→foci; cactus→cacti; cestus→cesti七、以-is结尾的名词，通常将-is改变为-es。
读音变化：尾音[is]改读[i:z]。
例：axis→axes; basis→bases; naris→nares; hypothesis→hypotheses; restis→restes八、以-ix结尾的名词，通常将-ix改变为-ices，但有例外。
读音变化：尾音[iks]改读[isi:z]。
例：matrix→matrices; directrix→directrices; calix→calices; appendix→appendices 反例：affix →affixes九、以-um结尾的名词，将-um改变为-a。
读音变化：去掉鼻尾音。
例：forum→fora; stadium→stadia; aquarium→aquaria; datum→data; vacuum→vacua十、以-a结尾的名词，在该词末尾加上后辍-e。
读音变化：尾音[E]改读[i:]。
例：larva→larvae; formula→formulae; ala→alae; media→mediae; hydra→hydrae十一、部分单词的复数形式不变。
读音变化：保持原音。
例：fish→fish; sheep→sheep; cattle→cattle; deer→deer; salmon→salmon十二、极少数单词，其复数形式没有任何规律。
读音变化：没有规律。
例：man→men; woman→women; child→children; person→people; ox→oxen十三、一些单数词得加en才能变成复数词：例：ox→oxen; child→children; brother→brethren十四、一些单数词得改头换面一番,才能变成复数词例：analysis→analyses分析; basis→bases基础; datum→data数据; foot→feet;formula→formulae/formulas公式; goose→geese; louse→lice虱子; man→menmouse→mice; medium→media/mediums媒介; memorandum→memoranda/memorandums备忘录;parenthesis→parentheses 圆括号; phenomenon→phenomena现象; radius→radii 半径tooth→teeth; woman→women十五、有些名词是单数、复数不分的例：deer; fish; cannon; sheep; salmon 鲑鱼; trout 鳟鱼十六、一些名词虽分单数、复数，但出现次数多的总是单数词例：abscence; clothing; film; help; furniture家具; machinery机械; news; scenery风景; sugar; traffic交通十七、另一些名词则以复数词出现的机会较多例：bellows风箱; clothes; police; shorts短裤; scissors剪刀; spectacles眼镜; shears大剪刀trousers长裤; wages工资十八、compound nouns，这类复数词是以主要的名词来表示例：daughter-in-law→daughters-in-law 媳妇; father-in-law→fathers-in-law岳父man-of-war→men-of-war兵舰; maid-servant→maid-servantsstep-son→step-sons晚子; son-in-law→sons-in-law十九、若表达具体数目，要借助数量词例：pair(对，双); suit(套); a pair of glasses; two pairs of trousers二十、另外还有一些名词，其复数形式有时可表示特别意思，例：goods货物，waters水域，fishes（各种）鱼二十一、除人民币元、角、分外，美元、英镑、法郎等都有复数形式。
例：a dollar, two dollars; a meter, two meters以O结尾的词，许多加es构成复数，特别是一些常用词如：heroes,potatoes,tomatoes,echoes,tornadoes,torpedoes,dominoes,vetoes,mosquitoes,Negroes,mang oes,buffaloes,volcanoes但下面几类词只加s：1.以“元音+o”或“oo”结尾的词如:videos,radios,studios,folios,oratorios,embryos,zoos,bamboos,kangaroos,taboos2.一些外来词，特别是音乐方面的词，如：pianos,solos,concertos,tobaccos,mottos,cellos3.一些缩写词和专有名词，如：kilos,photos,memos,micros,Eskimos,Filipnos有个别词加两种词尾都可以，如：archipelago(e)s,halo(e)s,cargoes(英），cargos(美）名词由单数变成复数的练习写出下列名词复数leaf______ puppy_______ box_______ knife_______ fly______ fox______bus______ bench_____ brush_____ kiss______ church______ dish_____ruler______ peach________ glass_____ pencil________ boy______ zoo______ man______ roof_______ sheep_______ knife______ lady______ key______story______ watch______ bamboo______ city______ family______ day_____ apple_______ eraser______ speech______ thief______ mouse______ fish_____ goose____ people ______ ox_____ Chinese _______ deer _______ foot______ child_______ tooth_______ guy________ hero_______ spy______ boss_____ monkey______ city ______ goat ______ radio ________ horse ______ dog ______用所给的单词的复数的正确形式填空：1>There are so many________(wolf)in the forest.2>There are three ______(chair) in the classroom.3>These _______(tomato) are red.4>______(hero) are great.5>My brother looks after two ______(baby)6>There are some ______(deer) eating the grass.7>My father likes to eat _______(potato).8>Chinese ______(people)like to eat noodles.9>I have a lot of ______(toy) in my bedroom.10>I help my mother wash ______(dish) in the kitchen.11>I have two ______(pencil-box).12>There are some ______(bus)in the street.13>Peter has eight _____(foot).14>Linda has three _______(tooth).15>There are some ______(child) in the garden.16>Michael likes the ______(mouse).17>There are some ______(goose)in the river.18>My uncle and father are _____(man).19>Tom and King are _____(boy).20>Linda has three ______(tooth).选出正确形式1．I can see three ________ in the zoo.A monkeysB monkeysC monkey2.The pig has four ______. A. foot B. feet C. foots3.My two brothers are both ______.A. policemanB. policemansC. policemen4.There are four ___________ in the class.A. JapaneseB. JapanesesC. Japan5.I can see ten _____ in the picture. A. sheep B. dog C. pig6.The _____ has three______.A. boys, watchesB. boy, watchC. boy, watches7.C an you see _______on the plate? A. bread B. breads C. breades8.The girl often brushes her_____ before she goes to bed.A. toothB. toothsC. teeth9.Mr Black often drink some _________.A. milk B. milks kes10.There are some _____ on the floor. A. child B. water C. books11. _______ will learn English. A. Woman B. Women C. Man12.Lucy will show us some new ____ of hers.A. photoB. photosC. photoes13. I drank two ______.A. bottles of orangeB. bottle of orangeC. bottles of oranges14.The cat eats two ______ last night. A. mouses B. mice C. mouse15.I need a pen and some _____. A. books B. desk C. chair16 Jim was late for two classes this morning. He said that he forgot both of the ______.A. rooms numberB. Room numberC. Room’s numberD. Room numbers17. The newly-built library is a ______ building.A. five-storeyB. five storeysC. five-storey’sD. five storeys’18. --- Whose umbrella is it?--- It’s _______.A.somebody else’sB. Somebody elseC. Somebod y’s else’sD. Somebody’s else19. I feel terribly hot, What’s the _____?A. temperature of roomB. Room’s temperatureC. Room temperatureD. Temperature of room’s20. _______ will make a trip around the world during the coming Christmas.A. The EvensB. The Evens’C. The EvensesD. The Evenses’21.The girl talking to Mary is a friend of ________.A. Mary’s sisterB. Mary sister’sC. Mary’s sister’sD. sister of Mary’s22. The woman over there is ______ mother.A.Julia and Shelley’sB. Juli a’s and Shelley’sB. C. Julia and Shelley D. Julia’s and Shelley23. He is very tired. He needs ______.A. a night restB. a rest nightC. a night’s restD. a rest of night24．---Excuse me，where are _______ offices?---Over there．A．teacher’s B．teachers’ C．the teacher’s D．the teachers’25．Today is September 10th. It’s_____ Day. Let’s go and buy some flowers for our teachers.A. TeacherB. Teachers’C. the Teachers’D. Teacher’s。