1. What was your brother Charlie doing when I called him last night?
2. He was watching a football match when the light went off.
3. When you arrived at the wedding who else was there?
4. Susan was writing an email when she heard a noise coming from her balcony.
5. Yesterday I had breakfast, than I played tennis and later I met George for lunch.
6. While my friend were sleeping we were listening to the news.
:)