Debo in English: Meaning, Uses, and Examples

Author: Ilyas Baba

TL;DR

“Debo” in English usually means “I must,” “I should,” “I have to,” or “I owe.”
It comes from the Spanish verb deber, and the right translation depends on context.
Debo estudiar means “I must study” or “I should study,” while te debo dinero means “I owe you money.”
The phrase debo de often expresses probability, similar to “I must be” or “I’m probably.”

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The quick answer: what does “debo” mean in English?

The Spanish word “debo” is most commonly translated into English as:

• I must
• I should
• I have to
• I need to
• I owe

It is the first-person singular present tense form of the verb deber, meaning it refers to “I” in the present: yo debo.

The official dictionary of the Real Academia Española lists deber with meanings related to obligation and debt, including “to be obligated” and “to owe” (RAE, deber).

In practical English, debo does not have one single translation. It changes depending on the sentence:

Spanish	Natural English
Debo estudiar.	I must study. / I should study.
Debo irme.	I have to leave. / I should go.
Te debo dinero.	I owe you money.
Debo una explicación.	I owe an explanation.
Debo de estar cansado.	I must be tired. / I’m probably tired.

The most important rule is simple:
If “debo” introduces an action, it usually means obligation or advice. If it introduces a person or thing owed, it means “I owe.”

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“Debo” comes from the Spanish verb “deber”

To understand debo in English, learners need to understand deber.

Deber is a common Spanish verb used for:

1. Obligation, similar to “must,” “have to,” or “need to”
2. Advice or moral duty, similar to “should”
3. Debt, similar to “owe”
4. Probability, especially in the phrase deber de

The form debo is:

• Person: first person
• Number: singular
• Tense: present
• Mood: indicative
• Subject: yo, meaning “I”

So:

Yo debo = I must / I should / I owe

Spanish often drops the subject pronoun yo, because the verb ending already shows the subject. That means debo alone normally means “I must,” “I should,” or “I owe,” depending on what follows.

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Main meaning 1: “Debo” as “I must”

The strongest translation of debo is “I must.” This expresses a clear obligation, necessity, or duty.

Examples

Spanish	English
Debo terminar el trabajo hoy.	I must finish the work today.
Debo hablar con mi jefe.	I must speak with my boss.
Debo estudiar para el examen.	I must study for the exam.
Debo ser puntual.	I must be on time.
Debo decir la verdad.	I must tell the truth.

In English, “must” sounds direct and serious. It is often used for rules, responsibilities, strong personal decisions, or moral duties.

When “I must” is the best translation

Debo should often become “I must” when the speaker feels that something is necessary, urgent, or required.

For example:

Debo llamar al médico.
I must call the doctor.

This sounds stronger than “I should call the doctor.” It suggests that calling the doctor is important and not optional.

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Main meaning 2: “Debo” as “I should”

In many everyday situations, debo is softer than “must.” It often means “I should.”

Examples

Spanish	English
Debo comer más verduras.	I should eat more vegetables.
Debo dormir más.	I should sleep more.
Debo practicar mi inglés.	I should practise my English.
Debo tener más paciencia.	I should be more patient.
Debo ahorrar dinero.	I should save money.

This use expresses advice, personal reflection, or a recommended action.

“Must” vs “should”

The difference in English is important:

• I must study = studying is necessary or urgent
• I should study = studying is a good idea or recommended

Spanish debo estudiar could mean either. Context decides.

If a student has an exam tomorrow, debo estudiar may mean “I must study.”
If a student simply wants to improve, debo estudiar más may mean “I should study more.”

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Main meaning 3: “Debo” as “I have to”

Another very common translation is “I have to.”

In everyday English, “I have to” is often more natural than “I must.”

Examples

Spanish	English
Debo ir al banco.	I have to go to the bank.
Debo trabajar mañana.	I have to work tomorrow.
Debo recoger a mi hijo.	I have to pick up my son.
Debo pagar la factura.	I have to pay the bill.
Debo salir temprano.	I have to leave early.

“I must” vs “I have to”

Both can express obligation, but English speakers often use them differently:

• I must can sound personal, formal, or serious
• I have to sounds more everyday and practical

For example:

Debo irme.
I have to go.

This is usually more natural than “I must go,” although both are correct.

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Main meaning 4: “Debo” as “I need to”

Sometimes debo is best translated as “I need to.” This is common when the sentence is about a practical necessity.

Examples

Spanish	English
Debo comprar comida.	I need to buy food.
Debo descansar.	I need to rest.
Debo cambiar mi contraseña.	I need to change my password.
Debo revisar el documento.	I need to review the document.
Debo pedir ayuda.	I need to ask for help.

“Need to” often feels slightly less strict than “must,” but more practical than “should.”

Compare:

• I should rest = resting is advisable
• I need to rest = resting is necessary
• I must rest = resting is very important or required

The Spanish sentence debo descansar could become any of these, depending on tone and context.

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Main meaning 5: “Debo” as “I owe”

The other major meaning of debo is “I owe.” This is not about obligation to do an action. It is about debt, responsibility, or something that should be given to someone.

Examples with money

Spanish	English
Te debo diez euros.	I owe you ten euros.
Debo mucho dinero.	I owe a lot of money.
Le debo 50 dólares.	I owe him or her 50 dollars.
No debo nada.	I don’t owe anything.
¿Cuánto debo?	How much do I owe?

Examples beyond money

Spanish	English
Te debo una disculpa.	I owe you an apology.
Le debo una explicación.	I owe him or her an explanation.
Te debo un favor.	I owe you a favour.
Debo respeto a mis padres.	I owe respect to my parents.
Te debo la vida.	I owe you my life.

In this meaning, debo is followed by the thing owed, or by an indirect object such as te, le, or les.

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How to tell which meaning of “debo” is correct

The easiest way to translate debo is to look at what comes after it.

1. Debo + infinitive verb

When debo is followed by an infinitive verb, it usually means:

• I must
• I should
• I have to
• I need to

Examples:

Spanish pattern	English meaning
Debo estudiar.	I must / should study.
Debo trabajar.	I have to work.
Debo salir.	I need to leave.
Debo aprender.	I should learn.

Spanish infinitives often end in -ar, -er, or -ir, such as estudiar, comer, vivir, trabajar, salir, and aprender.

2. Debo + noun

When debo is followed by a noun, it often means “I owe.”

Examples:

Spanish	English
Debo dinero.	I owe money.
Debo una respuesta.	I owe an answer.
Debo una llamada.	I owe a phone call.
Debo impuestos.	I owe taxes.

3. Te debo / le debo / les debo

When debo appears with an indirect object pronoun, it commonly means “I owe.”

Examples:

Spanish	English
Te debo una.	I owe you one.
Le debo dinero.	I owe him or her money.
Les debo una explicación.	I owe them an explanation.
Te debo mucho.	I owe you a lot.

However, le debo decir la verdad can mean “I must tell him or her the truth.” So the words after the pronoun still matter.

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“Debo de” in English: probability, not obligation

The phrase debo de is special. It often expresses probability or assumption, not duty.

Examples

Spanish	English
Debo de estar cansado.	I must be tired. / I’m probably tired.
Debo de haberlo olvidado.	I must have forgotten it.
Debo de estar equivocado.	I must be wrong.
Debo de tener fiebre.	I must have a fever.
Debo de haber tomado el tren equivocado.	I must have taken the wrong train.

In English, this use of must does not mean obligation. It means logical conclusion.

For example:

Debo de estar cansado.
I must be tired.

This does not mean “I am required to be tired.” It means the speaker concludes that tiredness is probably the explanation.

“Debo” vs “debo de”

Traditional Spanish grammar often distinguishes:

• deber + infinitive = obligation
• deber de + infinitive = probability

Examples:

Spanish	English
Debo llamar a Ana.	I must call Ana.
Debo de haber llamado a Ana.	I must have called Ana. / I probably called Ana.

In real-life Spanish, speakers sometimes mix these forms, so context remains important.

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Negative forms: “no debo” in English

The negative form no debo can mean:

• I must not
• I should not
• I don’t have to, in some contexts
• I don’t owe

No debo + infinitive

When followed by an action, no debo usually means “I should not” or “I must not.”

Spanish	English
No debo fumar.	I should not smoke. / I must not smoke.
No debo llegar tarde.	I must not arrive late.
No debo decir eso.	I should not say that.
No debo comer tanto azúcar.	I should not eat so much sugar.
No debo olvidar la reunión.	I must not forget the meeting.

No debo + noun

When followed by a noun, no debo means “I don’t owe.”

Spanish	English
No debo dinero.	I don’t owe money.
No te debo nada.	I don’t owe you anything.
No debo impuestos.	I don’t owe taxes.
No le debo una disculpa.	I don’t owe him or her an apology.

“I must not” vs “I don’t have to”

English learners should be careful here.

• I must not go = going is prohibited or wrong
• I don’t have to go = going is not necessary

Spanish no debo ir usually means “I should not go” or “I must not go.”
For “I don’t have to go,” Spanish often uses no tengo que ir.

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Questions with “debo” in English

When debo appears in a question, it often becomes “should I,” “must I,” “do I have to,” or “do I owe.”

Obligation or advice

Spanish	English
¿Debo llamar ahora?	Should I call now?
¿Debo estudiar más?	Should I study more?
¿Debo esperar aquí?	Should I wait here?
¿Debo firmar este documento?	Do I have to sign this document?
¿Debo llevar pasaporte?	Do I need to bring a passport?

Debt

Spanish	English
¿Cuánto debo?	How much do I owe?
¿Te debo algo?	Do I owe you anything?
¿Debo pagar ahora?	Do I have to pay now? / Do I owe payment now?
¿A quién debo dinero?	Whom do I owe money to?
¿Debo una multa?	Do I owe a fine?

¿Cuánto debo? is especially common in shops, cafés, taxis, and restaurants. It means “How much do I owe?” or more naturally, “How much is it?”

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Common phrases with “debo” and their English meanings

Debo admitir

Debo admitir means “I must admit” or “I have to admit.”

• Debo admitir que tenías razón.
  I must admit that the person was right.

• Debo admitir que fue difícil.
  I have to admit that it was difficult.

Debo decir

Debo decir means “I must say” or “I should say.”

• Debo decir que estoy sorprendido.
  I must say that I am surprised.

• Debo decir la verdad.
  I must tell the truth.

Debo irme

Debo irme means “I have to go,” “I should go,” or “I must leave.”

• Debo irme ahora.
  I have to go now.

Te debo una

Te debo una means “I owe you one.”

This is a useful informal phrase after someone helps the speaker.

• Gracias por ayudarme. Te debo una.
  Thanks for helping me. I owe you one.

Debo estar

Debo estar can mean “I must be” when expressing a conclusion.

• Debo estar loco.
  I must be crazy.

However, debo estar en casa a las ocho means “I must be home at eight,” because the sentence expresses obligation.

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“Debo” compared with “tengo que”

Spanish learners often confuse debo and tengo que because both can mean “I have to.”

Debo

Debo can sound more formal, moral, reflective, or serious.

• Debo ayudar a mi familia.
  I must help my family.

• Debo ser honesto.
  I must be honest.

Tengo que

Tengo que is very common in everyday speech and often expresses practical necessity.

• Tengo que trabajar mañana.
  I have to work tomorrow.

• Tengo que comprar pan.
  I have to buy bread.

Main difference

Spanish	Usual feeling
Debo	duty, advice, moral obligation, formal necessity
Tengo que	practical necessity, everyday obligation

The two can overlap. Debo estudiar and tengo que estudiar can both mean “I have to study.” But debo may sound more like “I should” or “I ought to,” while tengo que sounds more like “I have to.”

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“Debo” compared with “debe” and “deben”

The form debo means “I must,” “I should,” or “I owe.” Other forms of deber refer to other subjects.

Spanish	Subject	English
debo	yo	I must / I should / I owe
debes	tú	you must / you should / you owe
debe	él, ella, usted	he, she, it, or you formal must / should / owes
debemos	nosotros	we must / should / owe
deben	ellos, ellas, ustedes	they or you plural must / should / owe

For a focused explanation of the third-person singular form, learners can compare this topic with debe in english. For plural subjects, deben in english explains how deben changes the meaning to “they must,” “they should,” or “they owe.”

This comparison matters because Spanish verb endings carry subject information. English usually needs the subject word: I, he, they, and so on.

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“Debo” in formal and informal English

The best English translation also depends on register.

Formal English

In formal writing, official communication, or serious statements, debo may be translated as:

• I must
• I am required to
• I am obliged to
• I owe

Examples:

Spanish	Formal English
Debo presentar el informe.	I must submit the report.
Debo cumplir con las normas.	I am required to comply with the rules.
Debo una explicación.	I owe an explanation.

Informal English

In casual speech, debo often becomes:

• I have to
• I need to
• I should
• I owe

Examples:

Spanish	Informal English
Debo irme.	I have to go.
Debo comprar algo.	I need to buy something.
Debo llamarlo.	I should call him.
Te debo una.	I owe you one.

A natural translation should match the situation, not just the dictionary.

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Common mistakes when translating “debo in English”

Mistake 1: Always translating “debo” as “must”

Must is correct in many cases, but it can be too strong.

• Debo comer mejor.
  Better: I should eat better.
  Possible but stronger: I must eat better.

Mistake 2: Forgetting the “owe” meaning

In te debo dinero, the meaning is not “I must you money.” The correct translation is:

I owe you money.

Mistake 3: Translating “debo de” as obligation

Debo de estar enfermo does not usually mean “I have to be sick.” It means:

I must be sick.
I’m probably sick.

Mistake 4: Confusing “must not” and “don’t have to”

No debo ir usually means:

I should not go.
I must not go.

It usually does not mean:

I don’t have to go.

For that, Spanish normally uses no tengo que ir.

Mistake 5: Ignoring tone

A single Spanish sentence can have multiple English translations.

Debo hablar contigo.

Possible English versions:

• I must speak with the person.
• I need to talk to the person.
• I should talk to the person.
• I have to speak with the person.

The best choice depends on seriousness, urgency, and relationship.

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Practice: choose the best English translation

1. Debo estudiar esta noche.

Possible translations:

• I must study tonight.
• I have to study tonight.
• I should study tonight.

If there is an exam tomorrow, “I have to study tonight” or “I must study tonight” fits well. If it is only a good idea, “I should study tonight” is better.

2. Te debo veinte dólares.

Correct translation:

I owe you twenty dollars.

3. Debo de estar equivocado.

Correct translation:

I must be wrong.
I’m probably wrong.

4. No debo comer tanto.

Possible translations:

I should not eat so much.
I must not eat so much.

5. ¿Cuánto debo?

Natural translations:

How much do I owe?
How much is it?

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Best translations of “debo” by situation

Situation	Spanish example	Best English translation
Strong obligation	Debo terminarlo hoy.	I must finish it today.
Everyday obligation	Debo trabajar mañana.	I have to work tomorrow.
Practical need	Debo comprar leche.	I need to buy milk.
Advice to oneself	Debo descansar más.	I should rest more.
Money debt	Te debo dinero.	I owe you money.
Social debt	Te debo una disculpa.	I owe you an apology.
Probability	Debo de estar cansado.	I must be tired.
Question for advice	¿Debo llamar?	Should I call?
Question about debt	¿Cuánto debo?	How much do I owe?
Negative advice	No debo hacerlo.	I should not do it.

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Why “debo” is hard for English speakers

Debo is difficult because English splits its meanings across several different verbs and modal expressions. Spanish uses one compact form, while English forces the translator to choose.

A learner translating into English must decide whether the sentence expresses:

• Duty: I must
• Practical obligation: I have to
• Recommendation: I should
• Necessity: I need to
• Debt: I owe
• Probability: I must be / I’m probably

This is why direct word-for-word translation often fails. The correct translation depends on grammar, context, and tone.

For general language proficiency descriptions, the Council of Europe’s CEFR framework is a useful reference because it describes what learners can do across levels of understanding and production (Council of Europe, CEFR). A learner working toward stronger Spanish-English accuracy needs more than vocabulary lists, especially with flexible verbs like deber.

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Final answer: “debo in English”

Debo in English means “I must,” “I should,” “I have to,” “I need to,” or “I owe.”

The best translation depends on what follows:

• Debo + verb usually means I must / I should / I have to / I need to
• Debo + noun often means I owe
• Te debo / le debo often means I owe you / I owe him or her
• Debo de + verb often means I must be / I’m probably

Examples:

• Debo estudiar. = I must study. / I should study.
• Debo irme. = I have to go.
• Te debo dinero. = I owe you money.
• Debo de estar cansado. = I must be tired. / I’m probably tired.

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FAQ

1. What does “debo” mean in English?

Debo means “I must,” “I should,” “I have to,” “I need to,” or “I owe.” The correct meaning depends on context.

2. Does “debo” mean “I owe”?

Yes. When debo is used with money, a favour, an apology, or another thing owed, it means “I owe.” Example: Te debo dinero means “I owe you money.”

3. Is “debo” the same as “tengo que”?

Sometimes. Both can mean “I have to.” However, debo can sound more like duty, advice, or moral obligation, while tengo que is often used for practical everyday necessity.

4. What does “debo de” mean?

Debo de often expresses probability. Debo de estar cansado means “I must be tired” or “I’m probably tired.”

5. What is the difference between “debo,” “debe,” and “deben”?

Debo means I must / I should / I owe. Debe refers to he, she, it, or formal you. Deben refers to they or plural you.

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