名词单数变复数PPT课件.ppt

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--boysman,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）---photos2child（孩子）childrenChinese(中国人)Japanese(日本人)（男人，妇女）3(二)不规则变化: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eswife(妻子)——wivesknife(小刀)---knivesshelf(架子)—shelvesleaf(叶子)---leaveswolf(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