Ответы
1. When she called, I was watching TV. (не поняла почему нужно преобразовать to be, типа, "когда она звонила, я был телевизором"?)
2. While we were having a picnic, it started to rain.
3. I was listening to music with headphones, so I didn't hear the phone.(добавила to music, а то получается что он просто слушал. нелогично)
4. What were you doing when you broke your arm? I was running after a bus.
5. Last night at 8, I was eating dinner.
6. At this time yesterday, I was looking out my window, watching snowfall.
7. I was driving after midnight last night, and I was so tired.
8. Really, you were shopping online all day yesterday?
9. While you were sitting around all night watching TV, I was studying English verb tenses.
10. What were you doing last Sunday? I was baking six cherry pies.