This is the 1820th most frequent Spanish word.
cuáles
"Which ones" or "which" (used in questions to refer to a choice among options).
Used to ask for a specific subset or choice from a group.
¿Cuáles son tus libros favoritos?
Which are your favorite books?
Refers to a subset of options available for a decision.
No sé cuáles elegir para leer esta noche.
I don't know which ones to choose to read tonight.
Expresses speculation or consideration about a group or options.