# Why is the subjunctive used in “Paso por una farmacia que *esté* abierta y te la compro”?

De camino a casa paso por una farmacia que esté abierta y te la compro.

Assuming the person goes by this Pharmacy every day and it is always open at that time I'm perplexed as to why the subjective form or the verb estar is being used.

• If you assume that, the sentence is absurd. The sentence means that this person is not thinking about a specific pharmacy; any open one will do. – Gorpik Jul 31 '19 at 8:54
• If the person knew about this pharmacy in particular, then they would say la farmacia or esa farmacia or refer to it by its name, i.e. they'd point to a definite pharmacy, and they'd then omit the hypothetical que esté abierta. – pablodf76 Jul 31 '19 at 11:00
• Pharmacies tend to have a rotating schedule for being open after hours; in some towns, pharmacies are somewhat clustered in a commercial district. The speaker apparently doesn't know yet which pharmacy he will visit. – aparente001 Jul 31 '19 at 13:23