How to Say "which ones" in Spanish
The Spanish word for “which ones” is “cuáles” — A1 level. This is a very common word in everyday Spanish.

Examples
¿Cuáles son tus libros favoritos?
Which ones are your favorite books?
No sé cuáles escoger de todas estas opciones.
I don't know which ones to choose from all these options.
Las reglas son muchas. ¿Cuáles debemos seguir primero?
There are many rules. Which ones should we follow first?
Always Plural
The word 'cuáles' is the plural version of 'cuál'. You must use it when you are asking about two or more things.
Asking for Selection
'Cuáles' asks you to pick specific items from a list or group. Think of it as asking, 'From this group, which specific ones?'
Confusing 'Cuáles' and 'Qué'
Mistake: “¿Qué son tus libros favoritos?”
Correction: ¿Cuáles son tus libros favoritos? ('Qué' usually asks for a definition or general information; 'Cuáles' asks you to select specific items.)
Using the Singular Form
Mistake: “¿Cuál son los problemas?”
Correction: ¿Cuáles son los problemas? (Since 'problemas' is plural, the question word must also be plural.)
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