名词单数变复数专练

名词单数变复数,WhatsthisinEnglish?,Itsanapple.,Whatarethese?,Theyareapples.,-Whatarethese?,-Whatsthis?,-Itsapen.,-Theyarepens.,-Whatarethose?,-Whatsthat?,-ItsanEnglishbook.,-TheyareEnglishbooks.,backpacks,watches,oranges,pens,-Whatrethese?-Theyre.,maps,cases,keys,-Whatrethose?-Theyre.,单数,复数,可数名词,如何变化？,规则变化,1.一般情况下，直接在词尾加-s构成复数形式。,car,backpack,cars,backpacks,book,books,1.,name,pen,card,ruler,names,pens,cards,rulers,box,2.以s,x,ch,sh等结尾的名词，在词尾加-es构成复数形式。,boxes,class,classes,watch,watches,brush,brushes,2.,bus,buses,foxes,dishes,3.以“辅音字母+y”结尾的名词，应改y为i，再加-es。,family,families,comedies,3.,以“元音字母+y”结尾的名词，直接在词尾加-s构成复数形式。,boy,boys,day,days,key,cities,strawberries,keys,4.以f或fe结尾的名词，先将f或fe变成v，再加-es构成复数形式。,knife,knives,half,halves,wives,leaves,wolves,roofs,roof,“小偷”(thief)的“妻子”(wife)用“刀子”(knife)和“树叶”(leaf)把“狼”(wolf)放在“书架”(shelf)上劈成两“半”(half)。,巧记：,6.以o结尾的名词，有的加-s,有的加-es构成复数形式。,photo,photos,heroes,tomatoes,zoos,6.,以o结尾的名词,表示无生命事物的名词，词尾加-s,表示有生命事物的名词，词尾加-es。,加-es的名词有:potato,tomato,hero，negro,巧记:黑人.英雄土豆.西红柿。,Sumup:,1.一般情况下,直接在名词词尾加-s.,2.以s,x,sh,ch结尾的名词,在词尾加-es.,3.以辅音字母加y结尾的名词，要变y为i再加-es.,4.以f或fe结尾的名词，先将f或fe变为v,再加-es.,5.以o结尾的名词,表示有生命事物的名词加-es。,给下列可数名词加复数,bird-card-lady-orange-ruler-photo-friend-boy-watch-girl-case-cat-wife-tree-key-bed-hero-family-dictionary-question-leaf-party-cup-,birds,ladies,oranges,rulers,cats,boys,girls,cases,wives,watches,trees,keys,questions,beds,heroes,friends,families,dictionaries,photos,cards,leaves,parties,cups,句子单数变复数Thisisabook.Thatisaneraser.Itisaredapple.Iamaboy.He/Sheisateacher.Whatsthis?,Thesearebooks.Thoseareerasers.Theyareredapples.Weareboys.Theyareteachers.Whatrethese?,复数句子变单数句子Thesearedictionaries.一般疑问句,并作