at high school
Él ha estado jugando al ajedrez desde que estaba en el instituto.
He has been playing chess since he was in high school.
Yo tocaba la flauta cuando estaba en el instituto.
I used to play the flute when I was in high school.
Usted y yo hicimos el examen en el instituto, tras el mismo pupitre.
You and I took the exam at the high school, behind the same desk.
— La infancia de Iván (1962)
At school.
Hice tres años de francés en el instituto.
I studied French for three years in high school.
They were boyfriend and girlfriend in high school.
Cuando estaba en el instituto me sabía un montón de chistes.
When I was in high school I knew a lot of jokes.
Bob era tímido cuando estudiaba en el instituto.
Bob was shy when he was in high school.