When do you use the imperfect tense in spanish?

Power going out story i need with a plot and the starting point is you wake up late, the power is out, and yeah. plz try to make it non complex since i have to write it in spanish if you want to go all out it needs to be in the preterit tense also know as past

Eva: sí ahora no. te acompañaré después de dos horas

1. choose the answer that best completes the sentence. (practicar) deportes. (2 points) a: practicas b : practico c: practican d : practicamos