Respuesta:
1. I was studying for my exam all night last night.
2. They were laughing at the joke when suddenly the power went out.
3. She was cooking dinner while he was setting the table.
4. We were walking in the park when it started to rain heavily.
5. He was playing guitar while his sister was singing along.
6. They were discussing the project when the boss entered the room.
7. The children were playing outside while their parents were gardening.
8. I was reading a book while waiting for the train to arrive.
9. The students were listening to the teacher's explanation during the class.
10. She was jogging in the park while listening to her favorite music.
