1. the director of studies at a science university?
1.a classmate from you biology class?
2.a well-known scientist?
3.a fellow member of your science club?
4.a journalist who wrote an article in a science magazine?
5.a relative asking them about their job?
6.your pen friend inviting them to stay with you?
2. Have I sent a letter to my friend? I haven't sent a letter to my friend.
3. Has she made a very bad mistake? She hasn't made a very bad mistake.
4. Have the children gone to bed? The children haven't gone to bed.
5. Have I seen a mouse in the kitchen? I haven't seen a mouse in the kitcen.
6. Have we met our business partners? We hanven't met our business partners.
7. Have I lost my student identity card? I havent' lost my student identity card.
8. Have they cleaned their rooms? They haven't cleaned their rooms.
9. Have the tourists visited the National Gallery? The tourists haven't visited the National Gallery.
10. Has the teacher checked our tests? The teacher hasn't cheked our tests.
11. Has Harry broked his car? Harry hasn't broken his car.
12. Have I forgotten his phone number? I haven't forgotten his phone numer.
13. Have they left for Rome? They haven't left for Rome.
14. Has Mary seen this film? Mary hans't seen this film.
15. Have we read this detective story? We haven't read this detective story.
16. Has he taken my credit card? He hasn't taken my credit card.