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名词单数变复数--Whatarethese?--What’sthis?--It’sapen.--Theyarepens.--Whatarethose?--What’sthat?--It’sanEnglishbook.--TheyareEnglishbooks.backpackswatchesorangespens--What’rethese?--They’re….mapscaseskeys--What’rethose?--They’re….名词单数变复数(一)规则变化:1.加s2.加s,x,ch,sh结尾的名词加es3.以辅音字母加y结尾的名词,先改y为i,再加es(mothers,fathers,sisters,brothers)(buses,boxes,watches)(family--familiesdictionary--dictionaries)区别key–keysboy--boys(二)不规则变化:2.man,womanmen,women1.以o结尾的名词有生命的加es:potatoes(土豆)tomatoes(西红柿)无生命的在词尾加s:zoo(动物园)—zoosradio（收音机）---radiosphoto(照片）---photosChinese(中国人)Japanese(日本人)3.child（孩子）children（男人，妇女）4.单复数同形(不变):sheep(绵羊)deer(鹿)fish(鱼),people(人，人民）mouse（老鼠）--mice5.ooee：foot(脚)—feettooth(牙齿)--teethgoose(鹅)--geese6.以f/fe结尾的,变f为v,再加es•wife(妻子)——wivesknife(小刀)---knives•shelf(架子)—shelvesleaf(叶子)---leaves•wolf(狼)---wolves名词单数变复数后s/es的读音1.在清辅音后读/s/2.在元音和浊辅音后读/z/3.在/s//z//∫////t//d/后读/iz/4.在/t/后读/ts/，在/d/后读/dz/∫desksmapsbrotherspensclasses,watches,orangescats,friendspendeskkeyboxknifecardorangeboyfriendparentmotherfathersisterbrothersondaughtercousinfamilychildmanpencilcasesheepssssesknivessssssssssssfamilieschildrenmenssheep名词单数变复数•tomato(西红柿）hero（英雄）negro（黑人）radio（收音机）photo（照片）life（生命）knife（小刀）thief（贼）roof（屋顶）zoo（动物园）piano（钢琴）potato（土豆）this–that–I–you–he/she/it–am/is–thesethoseweyoutheyare单数复数一、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?•7.Thisisadictionary•8Thatisyourbrother•9Sheisagirl•10ItisanIDcard•11Heismyuncle•12Iamastudent二、句型转换1.Thisismymother.1）变否定句2）变一般疑问句，并作肯定回答Thisisnotmymother.Isthisyourmother?Yes,it/sheis.2.Thatisacar.1）变否定句2）划线提问3)变复数句Thatisnotacar.What’sthat?Thosearecars.3.That’sanEnglishdictionary.1）变否定句2）变一般疑问句，并作否定回答That’snotanEnglishdictionary.IsthatanEnglishdictionary?No,itisn’t.4.Herfamilyname’sSmith.5.Myjacketislightblue.6.is,that,brother,my,Dave组词成句划线提问划线提问What’sherfamilyname?Whatcolorisyourjacket?Thatismybrother,Dave.句型转换1.What’sthis?复数What’rethese?2.He’saChineseboy.复数They’reChineseboys.3.Thisisabike.否定句复数句一般疑问句，并作肯定回答Thisisnotabike.Thesearebikes.Isthisabike?Yes,itis.4.Thatismybrother.否定句一般疑问句，并作否定回答Thatisnotmybrother.Isthatyourbrother?No,it/heisn’t.5.Thesearedictionaries.单数一般疑问句,并作肯定回答划线提问Thisisadictionary.Arethesedictionaries?Yes,theyare.Whatarethese?