1. I was going to the cinema at 4 o'clock yesterday.
2. I was going to the cinema when you met me.
3. What you were doing at 3 o'clock yesterday?
4. I was doing my homework from five till eight yesterday.
5. You were writing a letter at 6 o'clock yesterday?
Кажется, вот так. Вот. Уу~х исправила.