Question

Todos los viernes ellos ______________ el carro. (lavar)

Answer 1

The answer is
lavan

Answer 2

Answer:

lavaban

Explanation:

Use the imperfect tense.

When translated to english: Every Friday they washed the car

you would use imperfect tense because you may know when they start washing the car, but not when they finish. The imperfect tense is used when we don't have a defined beginning or end of the action that happened in the past.