Is his backpack on his desk?否定和肯定回答、

Is this his backpack?肯定回答 Tom put his notebook on the desk .改为否定句,一般疑问句,肯定回答,否定回答, Is this his backpack.(做出肯定的简略回答) 变成一般疑问句,并作肯定或否定回答.His books are on the desk.____________This His backpack is on the on the desk对on the desk画线提问 Is his pencil in the red backpack 作否定回答 Is his pencil in thered backpack 否定回答 His books are in the backpack 对这个句子做肯定回答以及否定回答 His earphones were on the desk just now.改为否定句：改为一般疑问句：肯定回答：否 It is his backpack改否定句 This is his backpack.改成否定句 His backpack is （under the desk）对括号进行提问 Are your watches on