Breakdown of Hay una posibilidad de que llueva.
de
from / of
llover
to rain
la posibilidad
the possibility
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Questions & Answers about Hay una posibilidad de que llueva.
Why is llueva in the subjunctive here instead of the indicative?
The phrase una posibilidad de que expresses uncertainty and doubt about whether the action will actually happen. This uncertainty triggers the subjunctive form llueva (from the verb llover).
Since this lesson is about a lo mejor, how would the sentence change if we used that instead?
If you use a lo mejor (maybe), you must use the normal indicative mood rather than the subjunctive. The sentence would become A lo mejor llueve. Even though it expresses probability, a lo mejor is a special exception that always takes the indicative.
Why is there a de before que? Can I just say posibilidad que?
You need the de. In Spanish, when a noun like posibilidad, idea, or miedo is followed by a clause starting with que (that), they must be linked by the preposition de. A helpful trick is to remember that in English we also say possibility "of" something.
Why does llueva translate to "it will rain" if it is in the present subjunctive?