4. 2) We were walking when we saw the fire.

3) While the plane landed, Elena was waiting at the airport.

4) When Richard was checking the map, I got some petrol.

5. 1. A What were you doing when I arrived just now?

B Tammi played the piano and we painted in the kitchen.

A I thought the phone was ringing.

B I don't think so. We weren't heard anything.

2. A How was your brother taking this blurred photo of a horse?

B He waited for the right moment, when someone was walking into him.

A And then what happened?

B While I helped him, the horse running away!