Change from Active into Passive Voice. 1.She has just posted those letters. 2.The teacher has already checked my test

1. Those letters have just been posted by her.

2.  My test has already been checked by the teacher.

3. All the windows has just been opened by him.

4. The present has already been bought by us.

5. This exercise has just done by me.

6. The key has already been found by them.

7. Dinner is being cooked in the kitchen.

8. When I came, the vase has been broken.

9. The letters were being written  at 5 o`clock.

10. The table is being laid at the moment.

11. The chairs have been taken  from the classroom.

12. He is being taught now.

13. The fish had been caught before we arrived.