Cuando era niño, jugaba en el parque.
English: When I was a child, I used to play in the park.
The 'pretérito imperfecto' is a past tense in Spanish. It describes actions or situations that happened regularly or over a period of time in the past.
Use the 'pretérito imperfecto' to talk about repeated or habitual actions in the past, to describe situations or people in the past, or to give background information in a story.
Cuando era niño, jugaba en el parque.
English: When I was a child, I used to play in the park.
Mi abuela siempre cocinaba los domingos.
English: My grandmother always cooked on Sundays.
Antes, vivíamos en Madrid.
English: Before, we lived in Madrid.
Los estudiantes leían libros cada semana.
English: The students read books every week.