1. What’s this?
  It’s a desk.

2. Is it a chair? (Is this a chair?)
  Yes, it is. / No, it isn’t.

3. What’s that?
  It’s a pen.

4. What are these?
   They are pencils.

5. Are they pens?
  Yes, they are. / No, they aren’t.

6. What are those?
   They are pens.

7. How many desks are there?
   There are seven.

8. Is this your pen?
   Yes, it is. / No, it isn’t.

9. Is this her/his eraser?
   Yes, it is. / NO, it isn’t. It’s my eraser.

10. Close the door.

11. Open the window.