 As mentioned the usage for the past perfect is to relate to past actions that are in the past so We always add the past perfect tense for the action that happened Before the past action that we're talking about so I Want to say that we arrived In the past, but I also want to let you know that something happened even before we arrived So I use the past perfect tense again our auxiliary verb To have conjugated into the past as well as our past participle form of the main verb The resulting sentence could be something like the concert had started by the time we arrived