The accent mark is a grammar label
Spanish accent marks are often taught as pronunciation marks. That is partly true. Many accent marks show stress when a word breaks the default stress rules. But the accent marks on qué, quién, cuál, cuándo, dónde, cómo, cuánto often do something more grammatical: they mark interrogative or exclamative force.
Compare:
¿Qué quieres?
What do you want?
El libro que quieres está aquí.
The book that you want is here.
Both words are spelled almost the same. The accent changes the function.
Qué asks for information or appears in an exclamation. Que connects clauses, introduces relative clauses, or functions as a conjunction.
The learner mistake is to think the accent appears only in direct questions with question marks. That is false.
No sé qué quieres.
I do not know what you want.
There are no question marks, but qué still has interrogative meaning. It introduces an embedded question.
The practical rule is:
Use the accent when the word expresses an unknown, question, exclamation, or indirect question. Do not use it when the word functions as a relative, conjunction, or ordinary connector.
Direct questions
In direct questions, the accented interrogative is usually obvious:
¿Qué dijo?
What did he/she say?
¿Quién llamó?
Who called?
¿Cuál prefieres?
Which one do you prefer?
¿Cuándo empieza la clase?
When does class start?
¿Dónde vive Ana?
Where does Ana live?
¿Cómo llegaste?
How did you arrive?
¿Cuánto cuesta?
How much does it cost?
In these examples, the accented word represents missing information. The speaker asks the listener to supply it.
The accent mark is not optional in careful writing. It marks the interrogative form.
Indirect questions
Indirect questions are questions embedded inside statements, commands, or other clauses.
No sé qué hacer.
I do not know what to do.
Dime cuándo llega.
Tell me when he/she arrives.
No entiendo cómo funciona.
I do not understand how it works.
Preguntó dónde vivíamos.
He/she asked where we lived.
These are not direct questions, so they do not use question marks. But the words still carry accents because they are interrogative.
A common editing error is:
No sé que hacer.
This reads like a different structure and is not the intended embedded question. Correct:
No sé qué hacer.
Another error:
Dime cuando llega.
This can mean “Tell me when he/she arrives,” as in tell me at the time of arrival, depending on context. To mean “Tell me what time he/she arrives,” write:
Dime cuándo llega.
The accent changes the clause type.
Que vs qué
Qué asks for identity, kind, content, or selection:
¿Qué pasó?
What happened?
No sé qué quiere.
I do not know what he/she wants.
¡Qué idea tan extraña!
What a strange idea!
Unaccented que has several roles:
El libro que compré es caro.
relative que: the book that I bought
Creo que viene.
complement que: I think that he/she is coming
Quiero que vengas.
complement que introducing a dependent subjunctive clause
Tan difícil que nadie lo entendió.
connector in a consequence structure
A useful diagnostic is whether the word points to an unknown.
No sé qué dijo.
There is an unknown: what did he/she say?
Sé que dijo la verdad.
No unknown: I know that he/she told the truth.
The first has qué. The second has que.
Como vs cómo
Cómo asks about manner, condition, or method:
¿Cómo estás?
How are you?
No sé cómo explicarlo.
I do not know how to explain it.
¡Cómo ha cambiado la ciudad!
How the city has changed!
Unaccented como can mean “as,” “like,” “since/because” in some contexts, or function in comparisons and clauses:
Hazlo como quieras.
Do it however/as you want.
Trabaja como médico.
He/she works as a doctor.
Es tan alto como su padre.
He is as tall as his father.
Como no llamó, salimos sin él.
Since he did not call, we left without him.
Compare:
No sé cómo lo hizo.
I do not know how he/she did it.
Lo hizo como pudo.
He/she did it as best he/she could.
Both involve manner, but the first embeds a question; the second introduces a relative-like or comparative manner clause.
Cuando vs cuándo
Cuándo asks about time:
¿Cuándo empieza?
When does it start?
No recuerdo cuándo empezó.
I do not remember when it started.
Unaccented cuando introduces temporal clauses:
Llámame cuando llegues.
Call me when you arrive.
Cuando era niño, vivía en Lima.
When I was a child, I lived in Lima.
The difference can be subtle:
Dime cuándo llegas.
Tell me what time you arrive.
Dime algo cuando llegues.
Tell me something when you arrive.
In the first sentence, the arrival time is unknown information. In the second, the arrival is the time condition for telling me something.
Donde vs dónde, adonde vs adónde
Dónde asks about location:
¿Dónde está el baño?
Where is the bathroom?
No sé dónde está.
I do not know where it is.
Unaccented donde introduces place relatives:
La casa donde vivo es pequeña.
The house where I live is small.
Adónde asks about destination:
¿Adónde vas?
Where are you going?
No sé adónde vamos.
I do not know where we are going.
Unaccented adonde/a donde can be relative:
Regresamos adonde empezó todo.
We returned to where everything began.
The accent again marks question/exclamation, not simply place.
Quien vs quién; cual vs cuál
Quién and quiénes ask about people:
¿Quién llamó?
Who called?
No sé quién llamó.
I do not know who called.
Unaccented quien/quienes are relative:
Quien llegue primero gana.
Whoever arrives first wins.
La persona con quien hablé fue amable.
The person I spoke with was kind.
Cuál and cuáles ask for selection from a set, identity, or choice:
¿Cuál prefieres?
Which one do you prefer?
No sé cuál es mejor.
I do not know which one is better.
Unaccented cual appears in relative expressions, especially with articles:
la razón por la cual renunció
the reason for which he/she resigned
cada cual hizo lo suyo
each one did their own thing
Learners should not reduce cuál to “which” and qué to “what” mechanically. Spanish uses cuál in some identity questions where English uses “what”:
¿Cuál es tu dirección?
What is your address?
The issue is often selection/identification rather than object-kind alone.
Cuanto vs cuánto
Cuánto asks about amount or degree:
¿Cuánto cuesta?
How much does it cost?
¿Cuántas personas vinieron?
How many people came?
No sé cuánto tiempo queda.
I do not know how much time is left.
Unaccented cuanto/cuanta/cuantos/cuantas can be relative or quantificational:
Haz cuanto puedas.
Do as much as you can.
Trajo cuantos libros encontró.
He/she brought as many books as he/she found.
This use is more formal or literary than many learner examples, but it explains why not every cuanto has an accent.
Exclamatives
The same accented forms appear in exclamations:
¡Qué bonito!
How beautiful!
¡Cuánto tiempo!
Long time no see! / So much time!
¡Cómo llueve!
How it rains! / It is really raining!
¡Quién pudiera viajar ahora!
If only one could travel now!
These are not information-seeking questions, but they still use accented interrogative/exclamative words because the words are tonic and expressive.
Do not write:
Que bonito!
Correct:
¡Qué bonito!
The three-way test
For any word like que/qué, ask three questions.
- Is it introducing a direct question or exclamation?
- Is it introducing an embedded question or uncertainty?
- Or is it connecting clauses as a relative/conjunction/time/manner marker?
Examples:
| Sentence | Form | Reason |
|---|---|---|
| ¿Qué quieres? | qué | direct question |
| No sé qué quieres. | qué | indirect question |
| El libro que quieres está aquí. | que | relative clause |
| Creo que quieres café. | que | complement clause |
| ¿Cómo funciona? | cómo | direct question |
| Funciona como esperábamos. | como | manner/comparison connector |
This test is more reliable than asking whether English translation contains “what,” “how,” or “when.”
Diagnostic workflow: direct question, embedded question, or connector?
When choosing between accented and unaccented forms, do not ask whether English uses “what,” “how,” or “when.” Ask what the Spanish word is doing.
Step one: is the word asking for an unknown value?
¿Qué pasó?
No sé qué pasó.
Both need qué because the content is unknown. The second is not punctuated as a question, but it is still an embedded question.
Step two: is the word linking a noun to a clause?
El informe que leí era claro.
Here que is relative. It does not ask anything. It points back to el informe.
Step three: is the word linking a subordinate clause as a conjunction?
Creo que tienes razón.
Again, no question. Use que.
The same workflow applies to the whole set:
| Embedded question | Connector or relative |
|---|---|
| No sé cuándo llega. | Llámame cuando llegue. |
| No entiendo cómo funciona. | Funciona como esperábamos. |
| Dime dónde vive. | La casa donde vive es antigua. |
| Preguntó quién venía. | Quien venga debe registrarse. |
| No sé cuál elegir. | La razón por la cual llamó era urgente. |
A useful editing trick is to replace the clause with “the answer to the question...” If that paraphrase works, the accented form is likely.
No sé qué dijo. → I do not know the answer to “What did he say?”
But:
El libro que compré... → the answer to “What book did I buy?” does not fit the grammar. The clause modifies libro, so que is unaccented.
This is also why punctuation alone is unreliable. No sé qué hacer has no question marks, but qué is mandatory. Conversely, ¿Crees que viene? is a question sentence, but que is unaccented because it is a complement marker, not the interrogative word.
Hidden-question test for embedded clauses
The hardest cases are not direct questions. The hardest cases are embedded clauses where English translation can hide the difference between a question and a time, manner, or relative clause.
Compare:
No sé cuándo empieza.
I don’t know when it starts.
Te aviso cuando empiece.
I’ll let you know when it starts.
Both English sentences contain “when,” but Spanish separates them. In the first, the speaker lacks an answer to the question “When does it start?” That hidden question requires cuándo. In the second, cuando empiece is a time condition: I will notify you at the time it starts. No hidden question is being asked, so there is no accent.
Use the hidden-question test:
- Can you insert “the answer to the question...”?
- Is someone asking, wondering, knowing, ignoring, explaining, or deciding a piece of information?
- Would the clause answer what, when, where, how, who, which, why, how much?
If yes, use the accented interrogative:
No explicó cómo lo hizo.
He/she did not explain how he/she did it.
If the clause simply sets time, manner, condition, or comparison, use the unaccented form:
Lo hizo como pudo.
He/she did it however he/she could.
This test prevents overcorrecting. Not every que/como/cuando/donde inside a longer sentence needs an accent. The accent belongs to interrogative or exclamative force, not to complexity itself.
V2 remediation refinement: the accent marks the presence of an unknown
The most durable rule for qué, quién, cuándo, dónde, cómo, cuál, cuánto is that the accent marks an interrogative or exclamative operator. In plain terms, there is an unknown value, a requested value, or an intensified value.
Direct question:
¿Dónde vive?
Where does he/she live?
Indirect question:
No sé dónde vive.
I do not know where he/she lives.
Exclamation:
¡Qué difícil!
How difficult!
Relative or connector:
la casa donde vive
the house where he/she lives
Lo hice como pude.
I did it as best I could.
A common remediation problem is that learners look only for question marks. That fails with indirect questions:
Dime cuándo llega.
Tell me when he/she arrives.
There is no ¿ ?, but cuándo llega still contains an unknown value. The accent stays.
Another problem is treating all embedded clauses after verbs like saber, decir, preguntar, entender, and explicar the same way. The meaning decides:
Sé que llegó.
I know that he/she arrived.
Sé cuándo llegó.
I know when he/she arrived.
Explícame cómo funciona.
Explain to me how it works.
El sistema funciona como esperábamos.
The system works as we expected.
The repair test is: can the clause be answered by a missing value? Dónde can be answered by a place, cuándo by a time, cómo by a manner, quién by a person, qué by a thing or proposition, cuánto by an amount. If so, the accented form is likely. If the clause merely links, compares, or modifies an antecedent, the unaccented form is usually right.
Suggested interactive module: interrogative accent classifier
A strong tool for this article would classify accent choice by clause function.
Suggested functions:
- Direct question detector: question marks and interrogative structure.
- Indirect question detector: verbs such as saber, preguntar, explicar, entender, decir plus unknown content.
- Relative/conjunction detector: antecedents, temporal clauses, manner clauses, complement clauses.
- Accent recommendation: que/qué, como/cómo, cuando/cuándo, donde/dónde, quien/quién, cual/cuál.
- Meaning contrast mode: show how dime cuándo llegas differs from dime cuando llegues.
Example input:
No entiendo como funciona.
Output:
No entiendo cómo funciona. The clause is an embedded question: “I do not understand how it works.”
Final rule
The accent on qué, cómo, cuándo, dónde, quién, cuál, cuánto marks interrogative or exclamative function. It appears in direct questions, indirect questions, and exclamations. It does not appear when the same-looking word is a relative, conjunction, temporal connector, manner connector, or complement marker.
Do not use question marks as your only diagnostic. Ask whether the word expresses an unknown or an exclamation. That is where the accent belongs.