past perfect - more uses

USE 2 Duration Before Something in the Past (Non-continuous Verbs)

With Non-progressive Verbs and some non-progressive uses of Mixed Verbs, we use the Past Perfect to show that something started in the past and continued up until another action in the past.

IMPORTANT Specific Times with the Past Perfect

Unlike the Present Perfect, it is possible to use specific time words or phrases with the Past Perfect. Although this is possible, it is usually not necessary.