1. Have you ever been to Lisbon?
2. Flight 201 for New York hasn't left yet.
3. John has been here for two weeks.
4. We have already visited the Science Museum.
5. Melanie has never been to a concert at the Royal Albert Hall.
6. A: Have you booked a hotel room? B: Yes, I've just booked one.
7. Peter hasn't travelled by boat since he was five years old.
8. This is the most comfortable hotel I've ever stayed at.
