Ellos comparten un afecto único; son inseparables.

Questions & Answers about Ellos comparten un afecto único; son inseparables.

How would the meaning change if the sentence said un único afecto instead of un afecto único?
Adjective placement completely changes the meaning of único. When placed after the noun (un afecto único), it means unique or one of a kind. If placed before the noun (un único afecto), it means only or single. Here, they share a unique affection, not their only affection.
Why do we use son (from ser) with inseparables instead of están (from estar)?
Even though relationships can evolve, being inseparable is treated here as a defining characteristic or inherent trait of their dynamic, which requires ser. Using estar would sound strangely literal, as if they were physically stuck to each other right at this very moment.
Is afecto the most natural word for affection here, or could I use cariño?
Both work perfectly. Cariño is extremely common in everyday Latin American Spanish for fondness or affection. However, afecto sounds slightly more profound or formal, which pairs beautifully with único to describe a deep, rare bond.
Why is único singular when there are two people (ellos) involved?
This is a quick reminder that adjectives always match the noun they modify, not the subject of the sentence. Único directly describes the noun afecto (which is masculine and singular), so it stays singular and masculine regardless of how many people share it.

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