Question

Carmen used to walk to the beach.

Answer 1

Carmen carina a ala playa

Answer 2

Right answer:

Carmen caminaba a la playa.

This sentence is given in the imperfect tense. The imperfect is used to talk about past actions, conditions, or events that occurred regularly or frequently or that were in progress in a moment in the past. So Carmen used to walk to the beach. Thus, caminaba is the conjugation of the verb caminar for the third person singular in the imperfect.