Used to показывает, что некоторое действие всегда происходило или некоторое утверждение было верно в прошлом, но более не случается или уже не верно.
Мы используем Used to для описания:
David used to spend a lot of money on clothes. These days he can't afford it.
I used to start work at 9 o'clock.
I used to smoke a lot, nowdays I smoke a few cigarettes a day.
Vera used to eat meat, but now she is a vegetarian.
This building is now a furniture shop. It used to be a cinema.
Julia used to be fat, but now she is not so.
Nicole used to have very long hair when she was a child.
Magda used to be the best student in our group, but now Lena is the best.
Вопрос в утвердительной форме выглядит так: did + подлежащее + use to ... ?:
Did you use to eat a lot of fruits when you were a child?
Вопрос в отрицательной форме: подлежащее + didn't + use to ... (также возможно употребление used not to ...).
I didn't use to like him. или I used not to like him.
"Used to" или Past Simple
You used to play the piano.
Did you play guitar when you were young?
You did not play guitar when you were young.