333) Put in the Past Perfect Simple, Past Perfect Continuous
1. When Peter looked out of the window he saw it (snow).
2 I saw you (work) very hard.
3. When we first met, he (be) a lawyer for ten years.
4. His face looked familiar because I (meet) him before.
5. He told me that he (know) everything about the accident.
6. He was so exhausted because he (play) tennis for three hours.
7. The party (go on) for an hour when we arrived.
8. Before Mum came, the children (remove) the stains from the carpet.
9. After they (come) they talked to the police officer.
10. Before they discussed the new timetable, they (make) the sketch.
11. By the time we met the visitors, they (wait) for over half an hour.
12. Before he read the bad news, he (sip) a big gulp of water.
13. By the time the author finished writing the book, he (work) on it for ten months.​