What is Used to ?
Used to is showing that some- thing happened often or regularly in the past Didn’t she us There used to be lots of small shops in the village until the supermar- ket was built. When we were children, we used to go to France every year for our holi- days. The police think he used to live in London. He used not to smoke a pipe. (NOTE: The forms used in the negative and questions: He used to work in London, He didn’t use to work in London or He used not to work in London, Didn’t he use to work in London?)
source: Easier English, Student Dictionary Upper Intermediate Level