is this a backpack?（做肯定句回答）快啊 如果帮了我就给你悬赏分啊

This is a backpack.（对.backpack提问） This is ablue backpack.(改错为否定句)This a blue backpack.咋填 a backpack.A.That is B.This is 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 This is a backpack(改为复数句子)怎么改? Whose backpack do you think ____?A.THIS IS B,IS THIS 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 This is my backpack改为同义句 Who backpack is this?改正错句 中文意思：this backpack is his. Is this his backpack?肯定回答