This is a backpack(改为复数句子)怎么改?

This is a backpack(改为复数句子)怎么改? This is a backpack.（对.backpack提问） 英语 改复数句This is a pen.Is this your backpack?It's a black bag Is this your backpack?改成否定句怎么改 This is ablue backpack.(改错为否定句)This a blue backpack.咋填 a backpack.A.That is B.This is his backpack 改一般疑问句It's his backpack 改一般疑问句His telephone number is 535-2375 改一般疑问句This is my grandmother 改否定句 This is a backpack in English（同上）划线部分：a backpack This is a black backpack改为同义句 this is a blue backpack改为一般疑问句 This is a blue backpack改为同义句 Whose backpack do you think ____?A.THIS IS B,IS THIS It is his backpack改否定句 What's this?This is a backpack这个句子有问题吗? is this your backpack?翻译成中文 This is my backpack.改成复数形式 This is his backpack.改成否定句 is this your backpack?翻译成中文