Continuaron comprando la edición limitada antes de que costara el doble.

Questions & Answers about Continuaron comprando la edición limitada antes de que costara el doble.

Why is costara in the imperfect subjunctive here instead of the present subjunctive?
The main action, continuaron, happened in the past. Even though the price increase was an anticipated future event from the subjects' perspective at the time, we have to backshift the tense to match the past timeframe of the sentence. Since antes de que always triggers the subjunctive, the past context forces it into the imperfect subjunctive.
Would it be wrong to use the indicative past tense costaba instead of costara?
Yes, it would be incorrect. The phrase antes de que introduces an action that has not happened yet relative to the main verb, meaning it is viewed as unrealized. Because of this, antes de que always requires the subjunctive mood, regardless of whether the sentence is set in the past, present, or future.
Why do we use the gerund comprando instead of the infinitive comprar after continuaron?
In Spanish, verbs that express the continuation of an action, such as continuar and seguir, must be followed by the gerund (the -ndo form). While English allows the infinitive (continued to buy), Spanish strictly uses the gerund to express keeping up an action.
Why do we say el doble instead of just doble?
When using the word as a noun to mean twice as much or double the amount, Spanish requires the masculine definite article el before doble.

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