Used To + Infinitive
“Used to” represents a habit or something that we were accustomed to doing in the past that
we don’t do anymore at the present time. “Used to” is always followed by the infinitive form of the verb that comes
after it.
- I used to study German. (but I don’t anymore)
- She used to come to class late everyday, but now she’s always on time.
- My parents used to take me to restaurants all the time, but now we eat at home.
For the questions we have to use “did” because the verb is in the past.