The Spanish Verb DEBER
Deber can mean must, should, ought to, have to, or to owe. It appears constantly in advice, apologies, arguments, responsibilities, debts, and movie-style conversations.
Obligation
Debo irme.
I must go. / I have to leave.
Advice
Deberías descansar.
You should rest.
Probability
Debe de estar en casa.
He/She must be at home.
Debt
Te debo una.
I owe you one.
The four core meanings of DEBER
| Structure | Meaning | Example | English |
|---|---|---|---|
| deber + infinitive | must / should / have to | Debo estudiar. | I must / should study. |
| debería + infinitive | should / ought to | Deberías hablar con ella. | You should talk to her. |
| deber de + infinitive | must be / probably | Debe de estar ocupado. | He/She must be busy. |
| deber + noun | to owe | Te debo dinero. | I owe you money. |
DEBER vs TENER QUE vs HAY QUE
The difference is not always absolute. Tener que usually sounds like practical necessity from work, schedule, family, school or circumstances. Deber often sounds like duty, advice, responsibility or formal obligation. Hay que is impersonal: it sounds like a general rule.
Personal duty / advice
Debo estudiar.
I should / must study.
Concrete necessity
Tengo que estudiar.
I have to study.
General rule
Hay que estudiar.
One must study. / It is necessary to study.
Debes vs Deberías
Both forms are possible, but the tone changes. Debes can sound direct or strong. Deberías is softer and usually safer for advice.
Debes decir la verdad.
You must / should tell the truth.
Deberías decir la verdad.
You should tell the truth. Softer advice.
No deberías preocuparte tanto.
You shouldn’t worry so much.
Deber de + infinitive
Use deber de + infinitive for probability, assumption or logical guess. In real speech, many speakers also omit de, but this pattern is clear for learners.
- Debe de estar en casa. He/She must be at home.
- Deben de ser las cinco. It must be five o’clock.
- Debe de haber un error. There must be a mistake.
DEBER = to owe
This is one of the most important real-life meanings of deber. It is used for money, favors, apologies, explanations, answers, truth, gratitude and emotional debt.
¿Cuánto te debo?
How much do I owe you?
Te debo una.
I owe you one.
Me debes una disculpa.
You owe me an apology.
No te debo nada.
I don’t owe you anything.
Should have done: debería haber + participle
For regret, criticism or missed opportunities, the safest pattern is debería haber + past participle. Past forms like debí and debía are correct, but this structure is often clearer for “should have done.”
Debería haber estudiado más.
I should have studied more.
Deberías haberme llamado.
You should have called me.
No debería haber dicho eso.
I shouldn’t have said that.
Deberíamos haber salido antes.
We should have left earlier.
Important comparison
Debí llamarte. = I had to call you / I should have called you. Context matters.
Debía llamarte. = I was supposed to call you.
Debería haberte llamado. = I should have called you. Very clear regret.
Movie-style sentences with DEBER
Me debes una explicación.
You owe me an explanation.
Debo decirte algo.
I have to tell you something.
Deberías irte.
You should leave.
No deberías estar aquí.
You shouldn’t be here.
Te debo la vida.
I owe you my life.
Deberías saberlo mejor que nadie.
You should know that better than anyone.
DEBER conjugation cheat sheet
Deber is a regular -er verb. The meanings change with context: must, should, owe, or have to.
| Pronoun | Present | Preterite | Imperfect | Conditional | Present Perfect |
|---|---|---|---|---|---|
| yo | debo | debí | debía | debería | he debido |
| tú | debes | debiste | debías | deberías | has debido |
| él/ella/Ud. | debe | debió | debía | debería | ha debido |
| nosotros | debemos | debimos | debíamos | deberíamos | hemos debido |
| vosotros | debéis | debisteis | debíais | deberíais | habéis debido |
| ellos/ellas/Uds. | deben | debieron | debían | deberían | han debido |
Common mistakes with DEBER
1. Translating deber only as “must”
Better: deber can mean must, should, ought to, have to, or owe.
Deberías descansar.
You should rest.
2. Using deber when tener que sounds more natural
For daily practical necessity, tener que often sounds more natural.
Tengo que comprar pan.
I have to buy bread.
3. Forgetting “to owe”
Me debes dinero.
You owe me money.
4. Confusing obligation and probability
Debe trabajar.
He must / has to work. Obligation.
Debe de estar trabajando.
He must be working. Probability.
Quick practice: understand the meaning
What should I do?
How much do I owe you?
There must be a problem.
You shouldn’t have trusted him.