Поставьте глаголы в скобках в нужное грамматическое время: Past Perfect или Past Perfect Continuous:
1) Sam never (hear) about it before he went to Scotland.
2) Nick was very tired. He (play) football for hours.
3) Andrea was very upset because she (have) a horrible nightmare.
4) Magdalena (work) as a sales assistant for 5 years before she became an actress.
5) Mark (play) football all day so he was very tired in the evening.
6) His friend (send) all the letters by the time Tom came to work.
7) Dave (buy) a ticket before he went to the concert?