Verified answer

1. How long have you known your best friend?

2. How long have you had a computer?

3. I have told you three times already. Don't touch my mobile phone.

4. I have not been to the new library yet. I am planning to go there next week.

5. Have you seen Murad yet? He came back from the UK yesterday.

6. I have not spoken to my friend since this morning.

7. We need to borrow new books from the library. We have already read our own books.

8. My grandparents have been married for more than 50 years.