This document is a presentation authored by David Vásquez for an English teaching class at Georgal Idiomas about teaching past tense and past perfect verb tenses. It outlines key concepts like basic sentence structure and verb knowledge. It explains that past tense and past perfect are used to distinguish between past events and identify earlier actions that led to recent events. Examples are provided of simple past tense sentences and ones using past perfect to talk about events that happened before another action in the past.