Ответ:

1. Mark can't win race now. he's just fallen off his bike.

2. I've never met a famous person.

3. have you cleaned your room yet? I've asked you thrre times.

4. Where's Yvonne? I've been here for an hour and she hasn't arrived.

5. Adam is very clever. he's already passed all his exams.

6. I haven't sent the email to amy yet