This document provides an exercise on using the past perfect tense in English. It contains 4 exercises with examples of sentences using the past perfect and questions to test the reader's understanding. The exercises cover putting verbs in the past perfect form, choosing between the past simple and past perfect tenses, filling in gaps with past perfect verbs, and identifying the correct past or past perfect verb forms in sentences. The goal is to practice using the past perfect tense properly in different contexts.