Ex. 1
1. How much did you pay for that painting?
2. I did not pay anything. It was a present.
3. When we arrived at the cinema, our friends were waiting for us.
4. My grandfather found a valuable manuscript while he was working in his attic.
5. He sold it to the museum for more than half a million a dollars.
Ex. 2
1. What kind of music did you use to listen when you were a child?
2. I used to listen to pop music. I did not use to like classical music then, but I do now.