1. We'd walked about two kilometers before we realized that we'd left the map behind.
2. We went for a walk when we'd finished the meal.
3. The sun was shining. People were sitting on the grass in the park.
4. I was exhausted after a long day at work, so I went to bed early.
5. Sam didn't recognize me, even though we'd met a few weeks before.
6. I locked the office door after I'd checked that everyone went home.
7. My parents first met when they were at university together. They were both studying history.