He was an American citizen for 20 years when the war had broken out.
He said he had spent the last 15 years of his life exploring the world.
I couldn't buy the record because I had lost the money
I didn't go to the museum with my class because I had been there before
When we had bought the house, it was empty for several years
Не уверена в правильности, но, как говорится, помогла, чем смогла)