This document discusses the use of the past tense "used to" to talk about past habits or repeated actions in the past. It provides examples of affirmative and negative sentences using "used to", including questions and short answers. It then gives examples of using "used to" in paragraphs describing past university experiences, a person from the past, a place visited in the past, and an activity done in the past. The purpose is to illustrate how "used to" is used to talk about habitual or repeated actions that occurred in the past but no longer continue in the present.