This document discusses various tenses in English grammar including past, present, and future tenses. It explains the simple, continuous, and perfect forms of each tense. For example, it states that the past continuous tense is used to describe an action that was ongoing at a specific time in the past, such as "He was reading a book." It also provides examples of how to form sentences in the simple past and present tenses affirmatively, negatively, and interrogatively.