The document discusses the past simple and past continuous tenses in Spanish. It provides examples of regular and irregular verbs in the past simple, how to form the past simple and past continuous, and how to use them in affirmative, negative, and interrogative sentences. It explains that the past simple is used to describe completed actions at a definite time in the past, while the past continuous expresses ongoing or incomplete actions in the past. Conjunctions like "when" and "while" can be used to join clauses using these tenses.