The document provides examples of sentences in the past perfect tense, which is formed using the past participle of the verb and the auxiliary verb "had". It gives rules for forming the past perfect tense, then lists example sentences using third form verbs and different pronouns and nouns such as "He had taken the selfie" and "We had taken bath with each other". The examples illustrate using the past perfect tense to talk about actions that were completed before some point in the past.