Ответ:

2. V  Have you ever flown on a plane? - Yes, I have.

3. X  Have you ever seen an elephant in real life? - No, I haven't.

4. V  Have you ever been to a concert? - Yes, I have.

5. V Have you ever travelled on a train? - Yes, I have.

6. V Have you ever built a snowman? - Yes, I have.

7. X Have you ever been on TV? - No, I haven't.

Объяснение: