Questions & Answers about ¿El edredón es mío?
In Spanish, singular countable nouns usually need an article or another determiner. So edredón normally needs el, un, este, mi, etc.
That is why ¿El edredón es mío? sounds natural, while ¿Edredón es mío? is generally not correct in normal Spanish.
Here, el edredón means the comforter / the duvet, referring to a specific one.
Mi is a possessive adjective, so it goes before a noun:
- mi edredón = my comforter
Mío is a possessive pronoun, so it replaces the noun or works after ser to show ownership:
- Es mío = It’s mine
- El edredón es mío = The comforter is mine
So in this sentence, mío is correct because it comes after es and expresses possession by itself.