Identify whether these sentences are in the active or the passive voice. Convert the sentences in the active voice to passive and those in the passive voice to active.

1. Seema is stitching the fabric.
2. These books are written by Mr Sen.
3. The students decorated the classroom with balloons and streamers.
4. The technician will clean the laboratory after the experiments are over.
5. An online bookstore had been started by Shivansh a couple of years ago.
6. A letter was being written by Advay to his grandmother yesterday.
7. Reema has made a chart on environmental issues.
8. The project will be completed by Arun today.
9. The potted plants in the balcony are being watered by Aruna.
10. I have borrowed five books from the library.​