It's my backpack.改为复数形式

It's my backpack.改为复数形式 This is my pencil.（改为复数句） It's his backpack.（改为复数句） It's my pencils.改为复数形式 My aunt has a childwhere’s his black backpack?改为复数形式 where’s his black backpack?改为复数形式 it' s a backpack.(改为复数句） 把It's my backpack.改为否定句 This is my backpack.改成复数形式 That isn't my backpack改为复数 it is anold backpack的复数形式 It is my pen.(改为复数形式) it's sweet改为复数形式