customs and habits

expresses things that were done in the past but no longer

subject+used to+verb

I used to have a red car

subject+didn´t+use to+verb

they didn't use to study

did+subject+use to+verb?

did she use to be vegan?

expresses things that were done in the past on a regular basis

subject+verb in past+complement

the children played football yesterday

subject+didn´t+infiniitive verb+complement

she didn't like to sit in the sun

did+subject+infinitive verb+complement

did she live in Japan last year?