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1、名词名词单数单数变变复数复数Whats this in English?Its an apple.What are these?They are two apples.-What are these?-Whats this?-Its a pen.-They are pens.-What are those?-Whats that?-Its an English book.-They are English books.backpackswatchesorangespens-Whatre these ?-Theyre .mapscaseskeys-Whatre those ?-Theyre .单
2、数复数可数名词如何变化？规则变化不规则变化规则变化规则变化1.一般情况下，直接在词尾加-s构成复数形式。carbackpackcarsbackpacksbookbooks1.namepencardrulernamespenscardsrulersbox2. 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“辅音字母+y”结尾的名词，应改y为i，再加-es。familyfamiliescomediesc
3、omedy(喜剧)yyld3.4. 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)roof(屋顶)roofsroof
4、“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：6. 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)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巧记:英雄爱吃英雄爱吃 土豆炖西红柿土豆炖西红柿。 Sum up:1.一般情况下,直接在名词词尾加-s.2.以s,x,sh,ch结尾
5、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 .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
6、-birdsladiesorangesrulerscatsboysgirlscaseswiveswatchestreeskeysquestionsbedsheroesfriendsfamiliesdictionariesphotoscardsleavespartiescupsthis that I you he / she / it am / is thesethoseweyoutheyare 单数单数 复数复数句子单数变复数句子单数变复数1. This is a book. 2. That is an eraser.3. It is a red apple. 4. I am a boy.5.
7、 He / She is a teacher.6. Whats this ? These are books.Those are erasers.They are red apples.We are boys.They are teachers.Whatre these ?复数句子变单数句子复数句子变单数句子 These are These are dictionariesdictionaries. .单数单数一般疑问句一般疑问句, ,并作肯定回答并作肯定回答划线提问划线提问 This is a dictionary.Are these dictionaries ? Yes, they are.What are these ?