1. USED TO DO ( Solía hacer)
Used to do something expresses something that we often did in the past, but don't do anymore. It is often used in the positive form to speak about repeated actions - something that was a habit, or a way of life. Generally, we use the form to contrast past habits with present situations.
2. TO GET USED TO (Acostumbrarse a)
Use these forms to express that a person is in the process of making something "normal". They are often used with the present continuous form.
When used with the present perfect, these two forms can imply that something that was difficult in the past has become normal.
3. TO BE USED TO (Estar acostumbrado a)
This form indicates that a situation has become normal for a person.