Breakdown of Durante la adolescencia mi hermano estaba muy tímido.
Questions & Answers about Durante la adolescencia mi hermano estaba muy tímido.
Both estaba and estuvo are past forms of estar, but they belong to different past tenses:
- estaba = imperfect (ongoing, repeated, or background state in the past)
- estuvo = preterite (completed, bounded event or state)
Durante la adolescencia mi hermano estaba muy tímido presents his shyness as an ongoing condition throughout that whole period. Adolescence is a stretch of time, not a single event, so the imperfect fits:
- estaba muy tímido = he was (used to be / was generally) very shy during that time.
If you said estuvo muy tímido, it would sound like his shyness was a more clearly delimited episode (e.g., he was very shy that one summer), and it would be less natural with durante la adolescencia, which already sounds like a broad stage of life.