This document contains exercises about using "used to" and "didn't use to" to talk about past habits and states. The exercises involve completing sentences with the correct forms of "used to" or "didn't use to", and choosing whether "used to" or "didn't use to" correctly completes sentences about activities from 200 years ago and personal past experiences and preferences. The document provides practice with using "used to" and "didn't use to" to talk about past versus present habits and behaviors.