this is he bog对he bag变复数提问

this is he bog对he bag变复数提问 This is a photo变复数.和 The books are in the bag对in the bag提问求了 This bag is old(变复数） he wants a green bag 对：a green bag 提问 is this your watoh 变复数 This is my mother.对my mother提问 This is a bag对a bag部分提问 This is a[backpack]变否定句、对画框部分提问、变复数句 This isn't an English book.变复数.Are they rulers?变单数.How is he 变复数1.This is a knife2.That is an apple tree3.He is a policem HE IS FROM AMERICA怎么变复数 He is a boy变复数形式 Is he a boy Yes,he is.(变复数)