1) Nick's brother had won the baseball game by the time Nick returned home from his trip
2) Steve had taken part in ski competitions by the time Nick returned home from his trip
3) Steve had bought some fashionable sportswear by the time Nick returned home from his trip
4) Nick's brother had begun doing yoga by the time Nick returned home from his trip
5) Nick's brother had organized a school football team by the time Nick returned home from his trip