ellos estudiaban

were studying, studied

→ estudiar
estudi to study + aban 3rd-person plural imperfect
verb · 3rd-person plural, imperfect tense Rare #48,817
were studying, studied Used for an ongoing or habitual action in the past.
SP: Mis amigos estudiaban en la biblioteca.
EN: My friends were studying in the library.
Conjugation of estudiar
Indicative imperfect
SingularPlural
First estudiaba —
Third estudiaba estudiaban
Subjunctive imperfect
SingularPlural
First estudiaba —
Third estudiaba estudiaban

Pero creía que los dos estudiaban juntos en las clases del MBA.

But I thought they were both studying together in the MBA classes.

— Kal Ho Naa Ho (2003)

Los alumnos estudiaban en grupos de dos.

The students studied in groups of two.

Estudiaban.

They were studying.

Los alumnos estudiaban en parejas.

The students studied in pairs.

Los dos estudiaban Derecho juntos.

The two were studying Law together.

— Locamente millonarios (2018)