The document discusses the use of "used to" and "would" when talking about past habits or states, as well as the past simple tense. It provides examples of how to use these terms correctly depending on if one is referring to a repeated past action, a single past event, or a past state. The document also covers interrogative and negative forms as well as the present tense equivalents. Finally, it examines the differences between "get used to" and "be used to", focusing on how they describe becoming accustomed to something new.