1) Ellie has become a professional athlete since she left school.

2) Davidson has held a record since he broken it in 1999.

3) We haven't seen Betty since she moved to Canada.

4) Barry's team has beaten us many times since they have started training with coach Mariow.

5) Janet has interviewed a lot of famous people since she got a job as a reporter.

Ответ:

1. Ellie has become professional athlete since she had left school.
2. Davidson has held record since he had broken it in 1999.
3. We haven't seen Betty since she had moved to Canada.
4. Barry's team have beaten us many times since they had started training with coach Marlow.
5. Janet has interviewed many famous people since she had got the job as a reporter.