The document provides information on Spanish verb tenses and structures in three parts: 1. It compares and contrasts the preterite and imperfect tenses, noting their uses for specific vs. non-specific time frames. 2. It explains the uses of the words "por" and "para" in Spanish, noting their different meanings relating to time, location, purpose, and more. 3. It outlines several Spanish verb structures - commands, the present perfect, double object pronouns, adverbs, the subjunctive mood, se impersonal, and the progressive - and provides examples and rules for forming them.