Present perfect. Change the following sentences to questions.

1. I have seen this show.

2. Quincy and Janet have worked together.

3. Trent has finished cleaning.

4. She has tried to contact you.

5. They have solved the problem.

6. They have left.

7. They have been here before.

8. They have started playing.

9. Faruk has lived in this town all his life.

10. It has stopped working.