The document provides instruction on using the past perfect tense to describe events that occurred before another past action. It defines the past perfect as expressing "the past of the past." Examples are given to illustrate forming positive, negative, and interrogative sentences in the past perfect. Exercises are included for the learner to practice using the past perfect in sentences describing ordered events. Forms of the past perfect continuous tense are also introduced and examples are given to demonstrate referring to actions that started in the past and continued up to another point in the past.