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.