Miguel ....... (play) guitar when he was a teenager.
Miguel used to play guitar when he was a teenager.
highschool / sing / I / used / in / to
I used to sing in highschool.
Do you used to walk to school?
Did you use to walk to school?
I would / used to hate eating strawberries.
used to
Sarab .......... (sing) in a choir when she was studying abroad.
Sarab used to sing in a choir when she was studying abroad.
late / used / go / to / Sarah / bed / to
Sarah used to go to bed late.
What do you use to think about?
What did you use to think about?
I would / used to go to the shops after class. 
Both correct.
When your sister was little, she ... (not believe) there were monsters under her bed.
When your sister was little, she didn't use to believe there were monsters under her bed.
around / the / James / did / not / travel / to / city / use
James did not use to travel around the city.
I didn't used to playing tennis.
I didn't use to play tennis.
I wouldn't / didn't use to travel to different cities.
didn't use to
Ray .........(not fight) with her brother when she was a child.
Raz didn't use fight with her brother when she was a child.
friend / Who / use / best / be / your / to / ?
Who use to be your best friend?
Amir use to liked eating spider.
Amir used to like eating spider.
I used to // would like watching a play in a theatre.
used to
Barry ......(not drink) coffee but now he drinks it.
Barry didn't use to drink coffee but now he drinks it.
work / for / travel / used / a / used / lot / Savannah / to
Savannah used to travel a lot for work.
Reza use to gone out at night alone.
Reza used to go out at night alone.
Why/When do we use "used to" in the past?
To talk about habits we did in the past but don't do now.