Ter de / Ter que for Obligation | Portuguese (Portugal) Grammar

English has a whole toolkit for expressing obligation — must, have to, need to, should, ought to — and so does Portuguese. But the single most common way to say "have to do something" in European Portuguese is built on a familiar verb: ter. The construction ter de / ter que + infinitive* literally means "to have (something) to do," and that semantic history matters. It explains why ter, the possession verb, is the language's workhorse for obligation, and it explains the (largely collapsed) prescriptive distinction between de and que.

For a deeper treatment of the de vs que prescriptive debate, see Ter de / ter que + Infinitive (Obligation). This page covers the same construction from a different angle: the semantic story of how possession becomes obligation, the full inventory of tenses ter can take in this construction, and the contrast with dever, precisar de, and ser preciso / necessário.

From "have something" to "have to"

Ter on its own means "to have": tenho um livro, "I have a book." The leap to obligation comes from a historical reanalysis:

tenho que fazer (literally: "I have things / something which to do") → "I have to do"

In older Portuguese, que in this construction was a relative pronoun meaning "(things) which," and tenho que fazer meant "I have things to do." Over time, the literal meaning faded and the whole phrase was reanalyzed as a unit meaning "I must do." Meanwhile, a parallel construction with de (tenho de fazer, "I have to do") emerged from a different path — de here is a preposition linking possession to purpose, as in tenho motivos de sobra ("I have reasons to spare"). Both routes converged on the same modern meaning: obligation.

This is why ter — the possession verb — feels right for obligation. The logic is: something is "mine to do," it falls into the set of duties I carry. Obligation is possession of a task.

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The deep metaphor is the same as the sensation family — tenho fome ("I have hunger"), tenho medo ("I have fear"). In Portuguese, states and duties are things you possess. The same verb is reused again and again because the metaphor is productive.

The present: tenho de / que + infinitive

Here is the basic paradigm.

Subject	Ter (present)	Example with sair	Meaning
eu	tenho	tenho de / que sair	I have to leave
tu	tens	tens de / que sair	you have to leave
ele / ela / você	tem	tem de / que sair	he/she/you have to leave
nós	temos	temos de / que sair	we have to leave
eles / elas / vocês	têm	têm de / que sair	they/you (pl.) have to leave

Mind the circumflex: plural têm, singular tem.

Tenho de ir ao médico amanhã — já tinha adiado duas vezes.

I have to go to the doctor tomorrow — I'd already put it off twice.

Tens de provar este bolo, é da minha avó.

You have to try this cake, it's from my grandmother.

Eles têm que acabar o relatório até sexta-feira.

They have to finish the report by Friday.

De vs que: register, not meaning

This is the famous distinction. Short version:

Ter de
infinitive
— traditionally preferred in Portugal, treated by strict grammarians as "correct" for expressing obligation. Slightly more formal in writing.
Ter que
infinitive
— historically comes from que = "(things) which," but in modern usage overlaps entirely with ter de. Very common in speech, also in writing.

In practice, educated Portuguese speakers use both, often interchangeably, often within the same paragraph. Some writers (and many teachers) maintain the de preference in formal writing; almost everyone uses que at least occasionally in casual speech.

Tenho de falar contigo, é urgente.

I have to talk to you, it's urgent. (slightly more formal / written)

Tenho que falar contigo, é urgente.

I have to talk to you, it's urgent. (slightly more colloquial)

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If you are unsure, use ter de in written Portuguese and either form in speech. You will never be wrong with ter de. Ter que is also correct, but if the text is being formally evaluated (an exam, a published article), ter de is the safer choice.

The full tense inventory

Ter de / ter que works in every tense that ter itself takes. The main verb stays in the infinitive — only ter changes. Here is what each tense looks like.

Imperfect: tinha de / que + infinitive ("had to")

Quando era criança, tinha de estudar todos os dias depois do jantar.

When I was a kid, I had to study every day after dinner.

Ela tinha que acordar às cinco para apanhar o primeiro comboio.

She had to wake up at five to catch the first train.

Used for repeated or habitual past obligations. For a one-off completed obligation in the past, see the preterite below.

Preterite: tive de / que + infinitive ("had to — and did")

Ontem tive de sair mais cedo do trabalho — o meu filho adoeceu.

Yesterday I had to leave work early — my son got sick.

Tivemos que cancelar a reserva à última hora.

We had to cancel the reservation at the last minute.

The preterite emphasizes that the obligation was carried out (or at least bounded in time). Compare: tinha de sair ("I had to leave" — background / ongoing state) vs tive de sair ("I had to leave" — and I did, on a specific occasion).

Future: terei de / que + infinitive ("will have to")

Se continuar assim, terei de procurar outro emprego.

If things go on like this, I'll have to find another job.

Terão que trabalhar no sábado para cumprir o prazo.

They'll have to work on Saturday to meet the deadline.

In speech, the future is often replaced by vou ter de / que + infinitive ("I'm going to have to"): vou ter de procurar outro emprego. Both are correct; the vou ter de version is more conversational.

Conditional: teria de / que + infinitive ("would have to")

Para resolver isso, teria de falar com o gerente.

To fix that, I'd have to talk to the manager.

Se fosses comigo, não terias que ir sozinho.

If you came with me, you wouldn't have to go alone.

Subjunctive (present): tenha de / que + infinitive ("have to")

Used after subjunctive triggers — expressions of doubt, desire, emotion, necessity, etc.

É pena que tenhas de ir tão cedo.

It's a pity you have to leave so early.

Espero que não tenhamos de repetir o exame.

I hope we don't have to retake the exam.

Subjunctive (imperfect): tivesse de / que + infinitive ("had to")

Se eu tivesse de escolher, ficaria com o primeiro.

If I had to choose, I'd take the first one.

Preferia que tu não tivesses de trabalhar no fim de semana.

I'd rather you didn't have to work on the weekend.

Subjunctive (future): tiver de / que + infinitive ("have to / will have to")

Se tiveres de sair, avisa-me antes.

If you have to leave, let me know first.

Quando tiveres de renovar o passaporte, eu acompanho-te.

When you have to renew your passport, I'll come with you.

Ter de vs dever, precisar de, ser preciso

Ter de / que is the strongest everyday "have to" in Portuguese. But it is not the only way to express obligation — it sits in a family of related constructions, each with a subtly different force.

Construction	Strength	Flavor
ter de / que inf.	Strong	Objective obligation, "must"
dever inf.	Weaker	Moral advice, "should"; or probability, "must be"
precisar de inf.	Medium	Need, not duty; "need to"
ser preciso / necessário inf.	Impersonal	"It's necessary to" — no specific subject
haver de inf.	Future-facing	Determination, promise, resolve; "I will / I shall"

ter de vs dever

Dever is a softer "should." Where ter de is about objective, pressing obligation, dever is about recommended behaviour or moral duty. Compare:

Tenho de ir ao dentista — tenho uma cárie a piorar.

I have to go to the dentist — I've got a cavity getting worse. (pressing obligation)

Devia ir ao dentista mais vezes.

I should go to the dentist more often. (advice, no urgency)

Dever also carries a second sense — probability. Ele deve estar em casa means "he's probably at home," not "he should be at home." Context usually disambiguates.

ter de vs precisar de

Precisar de means "to need." The structure is precisar de + infinitive (preciso de dormir, "I need to sleep") or precisar de + noun (preciso de café, "I need coffee"). It often overlaps with ter de in practice, but the flavor is different: ter de is obligation, precisar de is necessity.

Tenho de entregar o relatório amanhã.

I have to hand in the report tomorrow. (obligation, someone is requiring it)

Preciso de entregar o relatório amanhã.

I need to hand in the report tomorrow. (necessity, I need this to happen)

In many real situations, both work. But when the obligation comes from outside (deadlines, rules, expectations), ter de fits better; when the need comes from inside (exhaustion, hunger, urgency), precisar de fits better.

ter de vs ser preciso / necessário

Ser preciso / necessário + infinitive is the impersonal form — no specific subject, just "it's necessary to."

É preciso fechar a porta à chave.

You have to lock the door. / It's necessary to lock the door.

É necessário apresentar o bilhete de identidade.

One must present one's ID card. (formal notice)

Use this when the obligation applies generally, not to a specific person. It shows up a lot in signs, instructions, and rules.

ter de vs haver de

Haver de + infinitive is a different construction entirely — it expresses determination, resolve, or promise rather than pressing obligation. Hei de visitar o Japão ("I shall / I will one day visit Japan") is a statement of intent, not duty. Using haver de where ter de is meant shifts the meaning from "must" to "will, I promise":

Tenho de pagar a renda até ao dia 5.

I have to pay the rent by the 5th. (obligation)

Hei de pagar a renda.

I will pay the rent (eventually, I promise). (resolve — wrong register if it's a bill already due)

For the full picture of haver de, see Haver de + Infinitive.

Comparison with Spanish

Spanish uses tener que for the same job — the construction is near-identical to Portuguese ter que:

Spanish	Portuguese
tengo que estudiar	tenho de / que estudar
tenía que estudiar	tinha de / que estudar
tendré que estudiar	terei de / que estudar

The only structural difference: Spanish has only que; Portuguese has both de and que, with de being the traditionally preferred form in Portugal. If your Spanish instinct reaches for que, you are not wrong in Portuguese — but if you want to match the prescriptive Portuguese preference, switch to de.

Spanish also has haber de (he de hacerlo, "I must do it"), which is somewhere between Portuguese ter de and Portuguese haver de, and which is now archaic in most varieties of Spanish. Portuguese kept both ter de and haver de, distributing the meaning between them.

Common Mistakes

❌ Tenho estudar para o exame.

Incorrect — the linker de or que is obligatory.

✅ Tenho de / que estudar para o exame.

I have to study for the exam.

❌ Tenho que trinta anos.

Confused construction — this is not the ter que + infinitive obligation pattern but a broken age expression.

✅ Tenho trinta anos.

I'm thirty years old.

❌ Eles tem de ir.

Incorrect — plural subject needs the circumflex: têm.

✅ Eles têm de ir.

They have to go.

❌ Hei de pagar a multa hoje, senão perco o prazo.

Wrong register — this is an immediate obligation, not a distant promise. Use ter de.

✅ Tenho de pagar a multa hoje, senão perco o prazo.

I have to pay the fine today, or I'll miss the deadline.

❌ Deves ir ao médico — estás a sangrar.

Wrong register — dever is too soft for urgent, objective obligation.

✅ Tens de ir ao médico — estás a sangrar.

You have to go to the doctor — you're bleeding.

Key Takeaways

Ter de / ter que
infinitive*
is the everyday "have to" in EP, expressing objective obligation.
De is the traditionally preferred linker in Portugal, slightly more formal; que is the colloquial reality. Both are correct; both appear in print.
The construction works in every tense (tenho, tinha, tive, terei, teria, tenha, tivesse, tiver) — only ter changes, the infinitive stays.
For softer obligation use dever ("should"); for necessity use precisar de ("need to"); for impersonal rules use é preciso / necessário; for determined future use haver de ("I shall").
The construction inherits from ter's possession meaning — "to have (something) to do" became "to have to do" through centuries of reanalysis.

For a deep-dive into the de vs que question and its prescriptive history, see Ter de / ter que + Infinitive (Obligation).