The document discusses verb tenses and how they are formed using a verb's principal parts. It begins by reviewing the three main tenses - past, present, and future. It then introduces the six tenses total, including the present perfect, past perfect, and future perfect tenses. It explains that the principal parts of a verb, including the infinitive, present participle, and past participle, are used to form the different tenses. Specific examples are provided to demonstrate how each principal part is used to create the various tenses. The document also discusses conjugating irregular verbs and provides practice conjugating regular verbs in all six tenses.