. Choose the correct form of the verb.
1. The businessmen (are/ have been) at the talks for two hours.
2. What (did you do/ have you done) last night?
3. I (went/ have been) to many countries in my life.
4. How long (does he know/ has he known) Mr. Blake?
5. He (went/ has been) to Greece two years ago.
6. When (have you come/ did you came) here?
7. (Have you written/ Did you write) a letter to Mr. White yet?