Is this his backpack?肯定回答

Is this his backpack?肯定回答 Is this his backpack.(做出肯定的简略回答) Is this his backpack （做出肯定的简略回答） Is that her nice watch（改为肯定 Is this his car?（肯定回答) 中文意思：this backpack is his. This is his backpack.改成否定句 is that your friend 改为复数句 is this his backpack作否定回答 Is this his backpack -no it is that green backpack to him最后为 is that his jacket?　（作否定回答） is　this　her　key?（作肯定回答） His books are in the backpack 对这个句子做肯定回答以及否定回答 Is his pencil in the red backpack 作否定回答 Is his pencil in thered backpack 否定回答