Interrogative words: "Dónde?", "Cuál?", "Qué?", "Por qué?"

1. What are these words for?

In this unit you work with four very useful question words:

• Dónde – where (place)
• Cuál / Cuáles – which / which ones (choice)
• Qué – what (information, definition)
• Por qué – why (reason)

They all help you ask for specific information about work, studies and daily life.

2. Word order: where do we put the question word?

• The question word comes first in the sentence.
• Then you put the verb, then the subject if you say it.

Spanish	Structure	English
¿Dónde trabajas?	Dónde + verb	Where do you work?
¿Qué estudias?	Qué + verb	What do you study?
¿Cuál es tu profesión?	Cuál + ser	What is your profession?
¿Por qué estudias español?	Por qué + verb	Why do you study Spanish?

• Subject pronouns (yo, tú, él…) are often omitted: the verb ending shows the person.
• You can add them for emphasis, but they usually come after the verb:
  ▶ ¿Dónde trabajas tú? – still correct, more emphasis on “you”.

3. Spelling and punctuation: small details that matter

• In Spanish questions you use two question marks:
  ¿ at the beginning and ? at the end.
  ▶ ¿Dónde vives?
• Question words always have an accent in this use:
  dónde, cuál, cuáles, qué, por qué
• No accent = usually not a question word:
  porque (one word, no accent) = because (answer)
  por qué (two words, accent) = why (question)

Quick check: If you can replace it with “why” in English, you probably need por qué (two words, with accent).

4. DÓNDE – asking about place

Use dónde to ask about a location or place.

• ¿Dónde vives? – Where do you live?
• ¿Dónde trabajas? – Where do you work?
• ¿Dónde está la universidad? – Where is the university?

Common patterns:

• ¿Dónde + verbo de ubicación? (estar, vivir, trabajar, estudiar…)

Self-check: If the natural English question starts with Where…?, use dónde.

5. QUÉ vs CUÁL / CUÁLES – this is where many learners doubt

In English we often say “what…?”, but Spanish sometimes needs qué and sometimes cuál / cuáles.

5.1 Use QUÉ for “what…?” + noun

• Qué + noun = what + noun

• ¿Qué asignaturas tienes? – What subjects do you have?
• ¿Qué libro lees? – What book are you reading?
• ¿Qué idioma estudias? – What language do you study?

Think: you are asking about the type or name of a thing, and the noun is right next to the question word.

5.2 Use CUÁL / CUÁLES to choose from options

• Cuál (singular) / Cuáles (plural) = which / which one(s).
• Very often used with the verb ser (to be).

• ¿Cuál es tu número de teléfono? – What is your phone number? (literally: Which is…)
• ¿Cuál es tu profesión? – What is your profession?
• ¿Cuáles son tus libros favoritos? – Which are your favourite books?

Use cuál / cuáles when:

• There is a limited set of options (even if you don’t list them).
  ▶ professions, phone numbers, projects, courses, etc.
• You are asking for a specific one or some specific ones from a group.

5.3 A useful mini-table: Qué vs Cuál / Cuáles

Use	Question word	Example
What + noun?	Qué	¿Qué asignaturas tienes?
Which (one)? (choice, singular)	Cuál	¿Cuál es tu despacho?
Which ones? (choice, plural)	Cuáles	¿Cuáles son tus proyectos?

Quick rule of thumb:

• If you say "what + noun" in English → usually qué + noun.
• If you say "which (one) is…" or choose from options → usually cuál / cuáles.

6. POR QUÉ vs PORQUE – asking and answering “why”

Many learners confuse these. The meaning and spelling are different.

Form	Function	Example	English
por qué	Question word (2 words, accent)	¿Por qué estudias medicina?	Why do you study medicine?
porque	Answer word (1 word, no accent)	Estudio medicina porque me gusta.	I study medicine because I like it.

Self-check:

• If you can replace it with why → por qué.
• If you can replace it with because → porque.

7. Step-by-step: build your own questions

Follow these steps when you want to ask a question with these words:

1. Decide what you want to know.
   • Place? → dónde
   • Choice from options (which one / ones)? → cuál / cuáles
   • Information / definition or what + noun? → qué
   • Reason? → por qué
2. Choose the right verb.
   • Location → often estar, vivir, trabajar, estudiar
   • Identity / profession → often ser
   • Reason / action → verb that describes the action (estudiar, trabajar, hacer…)
3. Put the question word at the beginning.
   • Question word + verb (+ subject) + rest
   • Always with ¿ and ?

Examples following the three steps:

• Place + work → ¿Dónde trabajas?
• Profession as identity → ¿Cuál es tu profesión?
• Reason + Spanish → ¿Por qué estudias español?

8. Typical mistakes to avoid

• Mixing qué and cuál:
  • ¿Qué es tu número de teléfono?
  • ✔ ¿Cuál es tu número de teléfono?
• Forgetting the accent:
  • ¿Que estudias?
  • ✔ ¿Qué estudias?
• Using porque in a question:
  • ¿Porque estudias español?
  • ✔ ¿Por qué estudias español?
• Forgetting the opening question mark:
  • Dónde trabajas?
  • ✔ ¿Dónde trabajas?

9. Quick self-check

Cover the rules and answer these questions mentally:

1. To ask about place, which word do you use? (Expected: dónde)
2. To ask “Which is your profession?”, which word do you use? (Expected: cuál)
3. To ask “What subjects do you have?”, which word do you use? (Expected: qué)
4. To ask “Why do you study Spanish?”, which word do you use? (Expected: por qué)
5. Can you write one correct question with each of these: dónde, cuál/cuáles, qué, por qué?

If you can answer these and write four questions, you are ready to use these forms in conversation.