That is you backpack 改为复数
That is you backpack 改为复数
is that your backpack改为复数
That isn't my backpack改为复数
is that your friend 改为复数句 is this his backpack作否定回答
That is you dictionary改为复数句子
This is a backpack(改为复数句子)怎么改?
Whose is that backpack?(改为同义句) _______ does that backpack __
This is my pencil.(改为复数句) It's his backpack.(改为复数句)
It's my backpack.改为复数形式
That is ruler改为复数句
That is an egg 改为复数句
That is a box 改为复数句子