آنها در کلبه پناه گرفته‌اند تا برف بند بیاید.

From Lesson 254:Until (tâ, tâ inke)·Farsi

Questions & Answers about آنها در کلبه پناه گرفته‌اند تا برف بند بیاید.

Why is the verb بیاید in the subjunctive mood?
The word تا here means "until". Because the snow stopping is a future event that hasn't happened yet (an unrealized limit or boundary), Farsi requires the present subjunctive for the verb following تا.
What is the infinitive of the verb بند بیاید and how does it mean "stops"?
It comes from the compound verb بند آمدن (band âmadan). بند means "blocked" or "bound," and آمدن is "to come." This specific verb is commonly used to describe weather events like rain or snow stopping, as well as bleeding.
Why is the main verb پناه گرفته‌اند in the present perfect tense instead of the simple past?
The present perfect (پناه گرفته‌اند - "they have taken shelter") is used because the action started in the past, but the result is still ongoing. They are still inside the cabin right now waiting for the snow to stop.
Could we use تا اینکه instead of just تا in this sentence?
Yes, you could say تا اینکه برف بند بیاید. Both mean "until," but تا اینکه (tâ inke) is slightly more emphatic and spells out the transition a bit more, whereas just تا is shorter and very common in everyday speech.

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