1. I *was studying* when you called me. (Dica: verbo “to be” no passado + verbo com -ing)
2. She *was cooking* dinner at 7 pm yesterday. (Dica: ação contínua no passado)
3. They *were playing* football in the park last Saturday. (Dica: plural + verbo com -ing)
4. We *were watching* a movie when the lights went out. (Dica: ação que estava acontecendo no passado)
5. He *was reading* a book while waiting for the bus. (Dica: verbo “to be” no passado + verbo principal com -ing)
6. The children *were sleeping* when I arrived home. (Dica: plural + ação contínua no passado)
7. You *were listening* to music all afternoon. (Dica: verbo “to be” no passado + verbo com -ing)
8. It *was raining* heavily last night. (Dica: verbo “to be” no passado + verbo principal com -ing)
9. My mother *was cleaning* the house when I got back. (Dica: ação contínua no passado)
10. We *were talking* about the trip during lunch. (Dica: verbo “to be” no passado + verbo com -ing)

1. She *was studying* Thai grammar last night. (Dica: verbo “to be” no passado + verbo com -ing para ação contínua)
2. I *was waiting* for the bus when it started to rain. (Dica: ação que estava acontecendo no passado)
3. They *were dancing* at the party all evening. (Dica: plural + verbo com -ing)
4. He *was working* on his project yesterday afternoon. (Dica: verbo “to be” no passado + verbo principal com -ing)
5. We *were driving* to the beach when we saw the accident. (Dica: ação contínua no passado)
6. You *were studying* very hard for the exam last week. (Dica: verbo “to be” no passado + verbo com -ing)
7. The dog *was barking* loudly during the storm. (Dica: verbo “to be” no passado + verbo principal com -ing)
8. I *was thinking* about you all day yesterday. (Dica: ação que estava acontecendo no passado)
9. They *were traveling* around Thailand last summer. (Dica: plural + verbo com -ing)
10. She *was singing* a beautiful song when I arrived. (Dica: verbo “to be” no passado + verbo com -ing)