Question 1

Why do we use the subjunctive llegue here?

Accepted Answer

Para cuando translates to "by the time." Because the sunset is an anticipated future event that hasn't happened yet, Spanish requires the present subjunctive llegue to express that uncertainty or pending status. If this were a statement about a repeated habit, you would use the indicative.

Question 2

What does para cuando add that a simple cuando doesn't?

Accepted Answer

While cuando simply means "when," adding para creates a temporal deadline, meaning "by the time." It emphasizes that the prototype will be in a finished state before, or at the very latest by, the arrival of sunset.

Question 3

Could I use the future perfect ya habrá terminado instead of ya estará terminado?

Accepted Answer

Yes, but the nuance changes slightly. Habrá terminado ("will have finished") focuses heavily on the completion of the action itself. Estará terminado ("will be finished") focuses on the resulting state of the prototype at that future deadline. In this sentence, terminado functions as an adjective describing the prototype's condition.

Question 4

Why is the subject el atardecer placed after the verb llegue?

Accepted Answer

In Spanish, especially in relative or subordinate clauses like this one, it is very common to invert the subject and verb for a better rhythmic flow. Saying para cuando el atardecer llegue is technically fine, but para cuando llegue el atardecer sounds much more natural and native.

El prototipo ya estará terminado para cuando llegue el atardecer.

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