Is this key word preterite or imperfect: nacer

Is this key word preterite or imperfect: ayer

interrupting actions

Is this key word preterite or imperfect: ongoing actions (-ing)

Is this key word preterite or imperfect: descriptions/background information

Is this key word preterite or imperfect: one time actions

Is this key word preterite or imperfect: la semana pasada

Is this key word preterite or imperfect: anoche

Is this key word preterite or imperfect: una vez

generalmente

Is this key word preterite or imperfect: siempre or nunca

Is this key word preterite or imperfect: series of events (this happened, then this happened, then this happened)

Is this key word preterite or imperfect: beginning/end of events

Is this key word preterite or imperfect: muchas veces