单数变成复数 6-8
· 要背的词、及其复数形式：
book - books //书table - tables //桌子day - days //天car - cars //汽车watch - watches //看，注视fox - foxes //狐狸glass - glasses //玻璃，玻璃杯quiz - quizzes //测验；询问class - classes //班级bus - busses //公共汽车baby - babies //婴儿body - bodies //身体，躯体monkey - monkeys //猴子party - parties //聚会，排队dictionary - dictionaries //字典city - cities //城市tooth -teeth //牙齿child - children //儿童，小孩man - men //成年男子，男人person - people //人foot - feet //脚mouse - mice //老鼠；鼠标potato - potatoes //土豆，马铃薯goose - geese //鹅tomato - tomatoes //番茄，西红柿house - houses //房子cherry - cherries //樱桃moose - moose //麋鹿deer - deer //鹿ox - oxen //公牛，牛mosquito - mosquitoes //蚊子sheep - sheep //羊，绵羊hero - heroes //英雄box - boxes //盒子，箱子
要了解但无需背诵：
calf - calves //小牛hoof - hooves //蹄子elf - elves //小精灵dwarf - dwarves //小矮人thief - thieves //小偷，贼loaf - loaves //一块面包