Three books are under the desk.改为否定句

Three books are under the desk.改为否定句 Three books are under the desk（改为否定句） Those are books（改为单数句） Three baseball are under the desk 改为否定句 Three books are under the besk. 改为否定句 改为否定句 The math books are on the desk. The math books are on the desk.改为否定句 改为否定句,The math books are on the desk. Are the books on the desk?改为否定句 There are ten books in 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 three boys under the tree 改为否定句