变成一般疑问句,并作肯定或否定回答.His books are on the desk.____________This is my eraser________

问题描述:

变成一般疑问句,并作肯定或否定回答.His books are on the desk.____________This is my eraser________

Are his books on the desk?
Yes they are.
No.they aren't.
Is this your eraser?
Yes,it is.
No,it isn't.