1. She *had been studying* for hours before the exam started. (Dica: use “had been” + verbo com “-ing” para uma ação contínua no passado anterior a outra)
2. They *had been playing* football when it suddenly rained. (Dica: ação contínua no passado antes de outra ação)
3. I *had been working* all day before I took a break. (Dica: verbo “work” no past perfect progressive)
4. We *had been waiting* for the bus for 30 minutes before it arrived. (Dica: “wait” no past perfect progressive)
5. He *had been cooking* dinner when the phone rang. (Dica: ação em progresso antes de outra ação)
6. The children *had been watching* TV before their parents came home. (Dica: verbo “watch” com “-ing” e had been)
7. You *had been feeling* sick before you went to the doctor. (Dica: verbo “feel” no past perfect progressive)
8. She *had been reading* the book for weeks before finishing it. (Dica: uso correto do past perfect progressive)
9. We *had been traveling* for hours when the car broke down. (Dica: verbo “travel” no past perfect progressive)
10. He *had been practicing* the piano before the concert. (Dica: ação contínua anterior a outra no passado)

1. They *had been living* in the city before they moved to the countryside. (Dica: verbo “live” no past perfect progressive)
2. I *had been cleaning* the house all morning before the guests arrived. (Dica: ação contínua no passado anterior a outra)
3. She *had been jogging* every day before her injury. (Dica: verbo “jog” no past perfect progressive)
4. We *had been discussing* the project when the manager called. (Dica: verbo “discuss” com “had been” + “-ing”)
5. He *had been trying* to fix the computer all afternoon. (Dica: uso do past perfect progressive para esforço contínuo)
6. The students *had been preparing* for the test before the teacher gave the new topic. (Dica: verbo “prepare” no past perfect progressive)
7. You *had been studying* English for months before traveling abroad. (Dica: ação contínua anterior a outra no passado)
8. She *had been painting* the room before deciding to change the color. (Dica: verbo “paint” no past perfect progressive)
9. We *had been eating* dinner when the power went out. (Dica: ação em progresso no passado antes de uma interrupção)
10. He *had been working* on the report before the deadline was extended. (Dica: verbo “work” no past perfect progressive)