The document discusses the past continuous, present continuous, and future continuous tenses in English. It provides examples of how to form the affirmative, negative, and interrogative forms of each tense. Specifically, it explains that the past continuous tense indicates an action that was ongoing at some point in the past. It also discusses using the present continuous tense to describe current or frequent actions, and the future continuous tense to refer to actions that will be ongoing at a specific time or period in the future.