The document summarizes the differences between the phrases "used to" + infinitive and "be/get used to" + "-ing". "Used to" + infinitive refers to a repeated past habit or situation that is no longer true, such as "I used to drive on the left." "Be/get used to" + "-ing" means becoming familiar or accustomed to something, such as "Are you used to the cold weather yet?" or "I'm getting used to the noise now." The document provides examples of how each phrase structure is used in sentences.