1. You look happy. What has happened? — Oh, I haven't won the first prize. 2. Let's make a fruit salad. Have you bought bananas and apples? 3. The boys have already visited their sick friend, haven't they? 4. The tourist hasn't bought any souvenirs in the shop yet. 5. What have you done? — Ann has already translated the exercise and I have learnt the new words by heart. 6. Have the students written the test? — Not yet.