Is his backpack on his desk?否定和肯定回答、

Is his backpack on his desk?否定和肯定回答、 his backpack is on the floor.划线提问 His backpack is on the on the desk对on the desk画线提问 His backpack is on the bed.(改成一般疑问句)怎么改 His backpack is on the bed.(改成一般疑问句)怎么改 Is that his backpack the lost and found case?”处填什么?on in at of? It is his backpack改否定句 his pen is backpack 修改病句 This is his backpack.改成否定句 中文意思：this backpack is his. Is this his backpack?肯定回答 his watch is in his backpack改为否定句 not、 is、 his、 backpack、 it连词成句 His pen is in backpack这个句子哪里错了? Is his pencil in the red backpack 作否定回答 Is his pencil in thered backpack 否定回答用英语 Is this his backpack.(做出肯定的简略回答) Is the backpack on the floor No,it is 改错