改错here is nice backpack This is my book（变复数句）

题目

改错here is nice backpack This is my book（变复数句）
Those are his parents (变一般疑问句并做否定回答）
yes it is（变复数句）
就今天,越快越好!

答案

Here is a nice backpack.These are my books.
Are those his parents?No,they aren't.
Yes,they are.