2. I had been waiting for Tom in a restaurant for 20 minutes when I realized I was in a wrong restaurant.
3. At the time the factory closed down, Sarah had been working there for 5 years.
4. The orchestra had begun playing when the man in the audience suddenly begun shouting.
5. I begun walking along the road. I had walked 3 kilometers to the ice cream shop when I realized I left my wallet at home.
