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The sentence "Estarán juntos para siempre" is grammatically CORRECT in Spanish. Here's why:
1. "Estarán" is the future tense of the verb "estar" (to be) referring to a future action.
2. "Juntos" means together, indicating the state in which the subjects will be.
3. "Para siempre" translates to "forever," specifying the duration of them being together.
Therefore, the sentence "Estarán juntos para siempre" is grammatically correct in Spanish as it conveys the idea of being together forever.