1. When did you leave school?
2. How long has she been feeling unwell?
3. I've never met such a nice person before.
4. I've been waiting for you since four o'clock.
5. She has never written a letter by hand since she bought a computer.
6. I wonder where you have been all this time.
7. I have been learning English for five years.
8. You never know how he was going to react.
9. She has tripped over the cat and nearly fell over.
10. Look! I've found a ten-pound note! — Where have you found it?
11. Margaret is taking driving lessons now.
12. In recent years terrorism has become a greater threat.
13. The rain came suddenly and soaked all the washing.
14. Ever since we met, you have never asked me what I prefer to do.
15. How long have you lived here?
16. I have been interested in sports since my childhood.
17. What have you been doing since you left Cambridge?