The document discusses the use of the phrase "used to" in English. It expresses a habitual action in the past that no longer happens. Some key points:
- "Used to" indicates something was often repeated in the past but not currently done.
- It can describe past habits or facts that are no longer true.
- Questions about past habits use the past simple tense rather than "used to".
- "I am used to" means something is familiar, while "I used to" refers to something done regularly in the past.