el teatro solía abrir

the theater used to open

→ el
phrase Rare #37,437
the theater used to open "solía" + infinitive indicates a habitual action in the past. Here, the phrase is a partial clause rather than a fixed standalone expression.
SP: El teatro solía abrir a esta hora.
EN: The theater used to open at this time.

El teatro solía abrir como por ahora.

The theater used to open as it does now.

El teatro solía abrir solo los lunes.

The theater used to be open only on Mondays.

El teatro solía abrir al amanecer.

The theater used to open at dawn.

El teatro solía abrir los domingos.

The theater used to be open on Sundays.

El teatro solía abrir a esta hora.

The theater used to open at this time.

El teatro solía abrir temprano.

The theater used to open early.