This document provides instruction on the use of the phrase "used to" in English. It indicates that "used to" is used to talk about past habits or states that no longer exist. Examples are provided showing it used with different pronouns like "I", "you", "he/she/it", "we", and "they". The negative form uses "didn't use to". Exercises are included to practice using "used to" in the affirmative and negative, as well as questions using "Did...use to...". It also notes that "used to" should only be used for the past and not the present, instead using the simple past or present tense.