Answer:
You use preterite form when talking about past actions
ex: Ella caminó por el parque
You mainly use the imperfect tense when talking about repeated, usual, or habitual actions in the past
ex: Los sábados yo jugaba con mi vecino
Answer:
Yo cojo el tren para ir a la ciudad.
Explanation:
"Cojo" is the present first person conjugation of the verb "coger".