Tenemos que darnos prisa no sea que cierren la tienda.

would the future subjunctive not also be appropriate here? cerraren

I’m guessing in this example the speaker is skipping some words that would trigger the subjuctive. For example,

“Tenemos que darnos prisa [para que] no sea que cierren la tienda.”

The future subjunctive is not used in modern Spanish. I’ve only ever come across it in the occasional proverb.

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