1. I was riding (ride) my skateboard when I broke (break) my arm.
2. My brother was jogging (jog) in the park when the storm started (start)
3. My parents were walking (walk) on the beach when they saw (see) a dolphin in the ocean.
4.She was climbing (climb) the mountain when she fell (fall) and cut her leg.
5.He was hiking (hike) in the rain forest when he suddenly heard (hear) a bird singing.