This document provides instruction on how to form and use the past perfect tense and past perfect continuous tense in English. It explains that the past perfect tense is formed using "had" plus the past participle of the main verb, and is used to refer to actions completed before something else in the past or to provide reasons for past actions. The past perfect continuous tense is formed using "had been" plus the present participle of the main verb, and is used to refer to actions that started in the past and continued up to another past event or the cause of something in the past. Examples are given for affirmative, negative, and question forms for both tenses.