1. The plane has left the airport.

2. I haven’t visited Mexico .

3. Has the class begun ?

4. I have signed the contract.

5. Have you finished high school studies ?

6. She has told her boss she’s going to quit.

7. I’m leaving the country, but nobody knows .

8. Have you finished the book ?

9. He wanted to tell me the news, but I knew.

10. I’ve finished painting the bedroom.