Главным связующим звеном этих конструкций является значение привычного, повторяющегося действия. Отличие же - в категории времени. I used to live in London.
Varg and I used to work together.
Before Einstein, scientists used to think that space had no end.
The ancients used to say danger and opportunity were often the same thing. I’m used to getting up early.
Because I'm used to doing Q&As. I didn’t think I could ever get used to living in a big city after living in the country.I can't get used to being underground.