How to Say "which one" in Spanish
The Spanish word for “which one” is “cuál” — A1 level. This is a very common word in everyday Spanish.
Examples
¿Cuál es tu número de teléfono?
What is your phone number?
¿Cuál de estos libros prefieres?
Which of these books do you prefer?
Hay dos caminos. No sé cuál tomar.
There are two paths. I don't know which one to take.
Asking 'Which?' or 'What?'
Use 'cuál' to ask someone to choose from a set of options, even if you don't list them out loud. Think of it as asking 'which one?'
Plural Form: 'Cuáles'
If you are asking someone to choose more than one thing, use 'cuáles'. For example: '¿Cuáles son tus películas favoritas?' (What are your favorite movies?).
Mixing up 'Cuál' and 'Qué'
Mistake: “A common point of confusion is when to use 'cuál' vs. 'qué' (what). For example, learners might say: *¿Qué es tu nombre?*”
Correction: The correct way is '¿Cuál es tu nombre?'. A good rule of thumb: if you're asking for a specific piece of information (like a name, address, or favorite color) from a big list of possibilities, use 'cuál es'.
Using 'Cuál' Before a Noun
Mistake: “In English, we say 'Which car?'. It's tempting to say *¿Cuál coche?* in Spanish.”
Correction: But you should almost always use 'qué' right before a noun. Say '¿Qué coche prefieres?' instead. Use 'cuál' when the noun isn't directly next to it: '¿Cuál de los coches prefieres?' (Which of the cars do you prefer?).
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