1. I was waiting for my sister. She was buying something in the shop.
2. a. Who were you talking to... b. he was telling me....
3. a. Were your parents living... b. were living... was working...
4. a. Were you watching... b. was reading...
5. a. were you having...b. were talking
6. a. were you playing ... b. I wasn't playing,.... I was doing...
7. a. What were they wearing... b. were not wearing.. were wearing