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名词单数变复数What’sthisinEnglish?It’sanapple.Whatarethese?Theyaretwoapples.--Whatarethese?--What’sthis?--It’sapen.--Theyarethreepens.--Whatarethose?--What’sthat?--It’sanEnglishbook.--TheyareEnglishbooks.backpackswatchesorangespens--What’rethese?--They’re….mapscaseskeys--What’rethose?--They’re….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，直接加-srulerbackpackrulersbackpacksbookbooksnamepencardrulernamespenscardsrulersbox2.以s,x,ch,sh等结尾的名词，在词尾加-es。boxesclassclasseswatchwatchesbrushbrushessxshch2.3.以“辅音字母+y”结尾的名词，变y为i，再加-es。familyfamiliesyy3.strawberr(草莓)strawberries4.以o结尾的名词，有生命的加-es,无生命的加-sphotophotosheroestomatoeszooszoo(动物园)tomatohero(英雄).•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。把下列可数名词变为复数形式．orange--ruler--photo--friend--boy--watch--girl--case--tree--key--bed--hero--family-dictionary--question--party--cup--orangesrulersboysgirlscaseswatchestreeskeysquestionsbedsheroesfriendsfamiliesdictionariesphotospartiescupsthis–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?复数句子变单数句子Thesearedictionaries.单数一般疑问句,并作肯定回答划线提问Thisisadictionary.Arethesedictionaries?Yes,theyare.Whatarethese?