there is a box on the desk怎样修改为复数形式

there is a box on the desk怎样修改为复数形式 1、There is a book on the desk.改为复数形式 2、There are some kites there is a watch in the box改为复数形式 There is a knife on the desk.改复数句 There is a computer game on the desk 改为复数 there is a book on the desk改为复数句 Is there a watch on the desk?改为复数句 there is a pen on the desk 变为复数 改为复数形式 1.is there a bok on the desk?2.this is a nice dress. There is a book,two pencils and a box on the desk.请问用There i The box is on the desk.-----yes,the desk is ( )the box.A.ON there is an apple on the desk.怎样变复数?地点用不用变复数?