Ongoing conditions (mientras)

When sharing a workspace, you often need to establish ground rules. You can set ongoing conditions—things allowed as long as a rule is followed—using mientras.

You likely know mientras as "while." But paired with the present subjunctive, it means "as long as."

The studio is available as long as you respect the schedule.
El estudio está disponible mientras respetes el horario.
It doesn't bother me as long as you clean the common space.
No me molesta mientras limpies el espacio común.

The verbs following mientras—like respetes and limpies—are in the present subjunctive because they represent a requirement that must be met, not an established fact.

This structure is perfect for setting boundaries around personal equipment:

You can sit at the desk as long as it is not mine.
Puedes sentarte en el escritorio mientras no sea el mío.
You can use my material as long as you restock it tomorrow.
Puedes usar mi material mientras lo repongas mañana.
I will lend you the printer as long as you restock the ink.
Te presto la impresora mientras repongas la tinta.