--Hola, Jeremy:If María were a woman or a girl, these sentences would be correct:• ¿DE QUIÉN son los libros? ¿De María?• Whose are the books? María's? The problem is that these are NOT the sentences in your exercise.Apparently, the word 'María' is not a female name in this context, but a surname, and 'los María' refers to some siblings or to a whole family.In Spanish the word 'who?' can be singular ('¿quién?') if it refers to only one person, or plural ('¿quiénes?') if it refers to two or more people.I would try:• ¿DE QUIÉNES son los libros? ¿De los María?• Whose are the books? The María's?as if you said:• ¿DE QUIÉNES son los libros? ¿De los Petersons?• Whose are the books? The Petersons'?or:• ¿DE QUIÉNES son los libros? ¿De los niños?• Whose are the books? The boys'?I am almost sure that this is the answer you need: 'DE QUIÉNES'I can't think of any other alternatives.NOTE:Of course, you could also ask:• ¿DE QUIÉN son los libros? ¿De los María?• Whose are the books? The María'sWhen you ask a question like this, you are not supposed to know who the books belong to, i.e., you don't know if they belong to one person or to more than one. That's why you usually use the singular interrogative pronoun ¿'quién?' in these questions. However, this doesn't mean that the use of the plural pronoun is wrong. From the grammatical point of view, it is absolutely correct. And it would be the natural choice in a situation like this one, since the asker thinks that the books belong to more than one person. (I am assuming that both questions are asked by the same speaker.)This is just an exercise, Jeremy, so I think that the second question ('¿De los María?') has been added precisely to make you use the plural word '¿quiénes?' instead of '¿quién'? in the first question.Saludos. 😏 ....
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