there in a light on the desk.改为否定句

there in a light on the desk.改为否定句 There is a light on the desk.【改为否定句】 There is a light on the desk.改为否定句 There is a book on the desk.(改为否定句) there is a desk in the room ｛改为否定句｝ There is a basketball on the desk(改为否定句) There is a ball beh There were some books on the desk.(改为否定句) There are some books on the desk.改为否定句 There are two books on the desk.改为否定句 There are some book on the desk改为否定句 There are some magazines on the desk.(改为否定句) There are ten books in the desk改为否定句?