三年级英语名词单数变复数

名词单数变复数What’sthisinEnglish?It’sanapple.Whatarethese?Theyaretwoapples.--Whatarethese?--What’sthis?--It’sapen.--Theyarepens.--Whatarethose?--What’sthat?--It’sanEnglishbook.--TheyareEnglishbooks.单数复数可数名词如何变化？规则变化不规则变化规则变化1.一般情况下，直接在词尾加-s构成复数形式。carbagcarsbagsbookbooks1.namepenbedrulernamespensbedsrulersbox2.以s,x,ch,sh等结尾的名词，在词尾加-es构成复数形式。boxesclassclasseswatchwatchesbrushbrushessxshch2.busbusesfoxesfox(狐狸)dish(盘子)dishes3.以o结尾的名词，有的加-s,有的加-es构成复数形式。photophotosheroestomatoeszooszoo(动物园)tomato(西红柿)hero(英雄)3.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:hero,potato,tomato,巧记:英雄爱吃土豆炖西红柿。以oo结尾的名词变为复数时，词尾加-s,kangaroo（袋鼠）Kangarooszoo（动物园）zoos4.以“辅音字母+y”结尾的名词，应改y为i，再加-es。familyfamiliescomediescomedy(喜剧)yyld4.4.以“元音字母+y”结尾的名词，直接在词尾加-s构成复数形式。boyboysdaydaysoayy4.keycitiesstrawberrieskeyscity(城市)strawberry(草莓)5.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。knifekniveshalfhalves“小偷”(thief)的“妻子”(wife)用“刀子”(knife)和“树叶”(leaf)把“狼”(wolf)劈成两“半”(half)。5.wivesleaveswolveswife(妻子)leaf(树叶)wolf(狼)“小偷”(thief)的“妻子”(wife)用“刀子”(knife)和“树叶”(leaf)把“狼”(wolf)劈成两“半”(half)。巧记：名词单数变复数口诀•(一)规则变化•名词单数变复数，直接加-s占多数；•book-books;pen-pens;apple-apples•s,x,sh,ch来结尾，直接加上-es；•dress-dresses;box-boxes;•watch-watches;brush-brushes•词尾是f或fe，加-s之前先变ve；•leaf-leaves;wife-wives;knife-knives•辅音+y在词尾，把y变i再加-es；•study-studies;baby-babies;city-cities•元音+y在词尾,只加s就足够•boy–boys;day–days;monkey–monkeys•词尾字母若是o，常用三个已足够，要加-es请记好，hero,tomato,potato。•英雄爱吃土豆炖西红柿。•hero-heroes;potato-potatoes;tomato-tomatoes•其余o结尾的词加s,photo-photos;piano-pianos•(二)不规则变化•男人女人a变e，鹅足牙oo变ee；•man-men;woman-women;•goose-geese;foot-feet;tooth-teeth•老鼠虱子也好记，ous变ic；•mouse-mice;louse-lice•孩子加上ren，鱼鹿绵羊不用变•child-children;fish;deer;sheep•this---these(这些)•that--those(那些)•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.5.以f或fe结尾的名词，先将f或fe变为v,再加-es.6.以o结尾的名词,表示无生命事物的名词加-s,表示有生命事物的名词加-es。4.以“元音字母+y”结尾的名词，直接在词尾加-s.7、以oo结尾的名词变为复数时，词加-s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--birdsladiesorangesrulerscatsboysgirlscaseswiveswatchestreeskeysquestionsbedsheroesfriendsfamiliesdictionariesphotoscardsleavespartiescupsthis–that–I–you–he/she/it–am/is–thesethoseweyoutheyare单数复数句子单数变复数1.Thisisabook.2.Thatisaneraser.3.Itisaredapple.4.Iamaboy.5.He/Sheisateacher.6.What’sthis?Thesearebooks.Thoseareerasers.Theyareredapples.Weareboys.Theyareteachers.What’rethese?pendeskkeyboxknifecardorangeboyfriendparentmotherfathersisterbrothersondaughtercousinfamilychildmanpencilcasesheepssssesknivessssssssssssfamilieschildrenmenssheep一、写出下列单词的复数1.I--2.am--3.he–4.pencil--5.watch--6.dictionary--7.man--8.it--9.parent--10.boy–wearetheypencilswatchesdictionariesmentheyparentsboys复数句子变单数句子Thesearedictionaries.单数Thisisadictionary.