11.   The affair had been going on for years before her husband found out.

12.   The Coconino and Kaibab forests imposed closures this year before any other forests in this state.

13.   The story takes place at an unspecified date but clearly in the years immediately before the First World War.

14.   The temperatures necessary for melting glass had been achieved in the manufacture of copper alloys thousands of years before.

15.   What is it that happens in those years before kindergarten that specifically inhibits or promotes growth to self-sufficiency?

16.   Wiggins was a student of theology for many years before leaving the seminary.

17.   Hughes had been avoiding paying his taxes for years before the authorities finally caught up with him.

18.   The years before their arrival in prison are not counted as part of their sentence.

19.   He had actually left the company a year before the rumpus started.

20.   Many people suffer from clinical depression for years before being diagnosed.