1) Is there a computer? Yes, there is.
2)Are there any posters? No, there aren't.
3)Is there a clock? No there isn't.
4)Are there any students? Yes, there are.
5)Is there a cupboard? Yes, there is.
6)Is there a whiteboard? No, there isn't/
7)Are there any chairs?No, there aren't.
8)Are there any CD's? Yes, there are.