Question 1

Why do we need the pronoun la before debes if we already said cada caja?

Accepted Answer

This is a perfect example of left-dislocation, which is how we topicalize things in Spanish. When you move a direct object like cada caja to the front of the sentence to emphasize it, Spanish requires you to double it with a pronoun. Since caja is feminine singular, we use la to refer back to it.

Question 2

Could I attach la to the end of etiquetar instead?

Accepted Answer

Yes, absolutely. Because you have a conjugated verb followed by an infinitive (debes etiquetar), the object pronoun can either go before the conjugated verb or attach directly to the end of the infinitive. Saying Cada caja debes etiquetarla is perfectly natural and means exactly the same thing.

Question 3

Why is the verb llegue in the subjunctive here?

Accepted Answer

The phrase antes de que always triggers the subjunctive in Spanish. It introduces an action that hasn't happened yet at the time of the main verb, so you must use the subjunctive form llegue rather than the indicative llega.

Question 4

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

Accepted Answer

In Spanish, it is very common to invert the subject and verb in dependent clauses. This happens especially frequently with verbs of motion, appearance, or arrival like llegar. While antes de que el camión llegue is grammatically fine, putting the verb first sounds much more natural to native speakers.

Cada caja la debes etiquetar antes de que llegue el camión.

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