(a) My friends set out to see the caves in the next town, but I stayed at home, because I had seen them already.
(b) When they arrived at the station, their train had left. They came back home, but by that time I had gone out to see a movie!
(c) So they sat outside and ate the lunch I had packed for them.
(d) By the time I returned, they had fallen asleep!
Past | Earlier past
Set out | Had seen
Stayed | Had left
Arrived | Had gone
Came | Had packed
Sat | Had fallen