PAST CONTINUOUS:
P - S + was/were + Vb. -ing
N - S + wasn't/weren't + Vb. -ing
Q - Was/Were + S + Vb. -ing
Examples:
1) When I was in the room, the phone was ranging.
2) She was reading while he was runnning in the park.
3) When I was a child, we were reading on the garden.
4) You were cooking the cake when I ran on the stadium.
5) Were you making fun of him ?
6) I was not playing in the ground while he was doing his homework.
7) Was she taking the book for a while ?
8) They were talking about politics when we were singing our favourite single.
9) Were you learning for exam ?
10) They were not buying drinks while we were making the food.