The imperfect tense can be used to talk about the past and translates to what was happening, what used to happen and what was ongoing when something else happened
Form the imperfect by taking the nous form of the present tense, removing the -ons ending and adding the imperfect endings
je …ais - I was / used to …
tu …ais - you were / used to …
il/elle/on …ait - he/she/we was/were / used to …