Tener que + infinitivo: obligación personal

If you want to say "I have to do something" in Spanish, you reach for tener que + infinitivo. Tengo que estudiar, tienes que verlo, tenemos que salir ya — this is the workhorse expression for personal obligation in everyday peninsular Spanish, used hundreds of times a day by every Spaniard. It is one of the first constructions an A1 learner needs to lock in, and one of the few where there is essentially no register split: from a child at the dinner table to a CEO in a meeting, tener que is the default.

The structure

Three pieces, always in this order:

1. The verb tener conjugated in the present indicative, matching the subject.
2. The unchanging connector que — not optional, never replaced by de or anything else.
3. An infinitive (any verb in its dictionary form: -ar, -er, -ir).

The conjugation of tener (the part that trips people up)

Tener is irregular — and worth memorising cold, because you will use these forms constantly. The two trickiest pieces:

• yo tengo has a -go ending (the same irregularity as poner → pongo, salir → salgo).
• tú, él, ellos have a stem change e → ie (tienes, tiene, tienen) — but nosotros and vosotros keep the regular stem (tenemos, tenéis).

The vosotros form tenéis is two syllables (te-NÉIS) with a written accent on the é. You will hear it everywhere in Spain — at home, with friends, in casual workplaces.

What "obligation" actually means here

Tener que expresses personal obligation — a requirement, a necessity, a duty, or simply a strong recommendation. The source of the obligation can be:

• External rules: Tengo que llevar el carnet de identidad (I have to carry my ID).
• Practical necessity: Tengo que ir al baño (I have to go to the bathroom).
• Social or moral pressure: Tienes que llamar a tu madre, lleva tres días esperando (You have to call your mum, she's been waiting three days).
• Strong recommendation: Tienes que probar la tortilla de Betanzos (You have to try the Betanzos tortilla).

In all of these, the obligation falls on a specific person named by the subject. This is the defining feature that separates tener que from hay que.

Tener que vs hay que: personal vs impersonal obligation

This is the most important distinction in this grammatical neighbourhood, and one that English doesn't grammatically mark.

• Tener que + infinitive = a specific person has to do it. Conjugates with the subject.
• Hay que + infinitive = everyone in general has to do it; it's a general rule or norm. Invariable form (always hay que).

Tener que vs deber: practical vs moral

The other close relative is deber + infinitivo ("ought to / should"). The difference is one of force and source:

• Tener que is concrete, practical, often urgent. The obligation comes from outside circumstances or strong necessity.
• Deber is more moral, abstract, or advisory. It expresses what is right or proper.

In everyday Spain, tener que dominates. Deber sounds more formal, more moralistic, or more bookish, and is often softened with the conditional (debería, deberías) for advice-giving.

Pronoun placement

When the infinitive has object or reflexive pronouns, you have a choice: put them before tener or attach them to the infinitive. Both are equally correct and equally common.

When pronouns stack, they stay together as a unit. Attached pronouns may require a written accent to preserve the original stress: decir + te + lo → decírtelo.

Negation: 'I don't have to' is NOT 'I must not'

This is a subtle but important point that trips English speakers up. In English, "you must not" and "you don't have to" mean very different things ("you must not go" = forbidden; "you don't have to go" = optional). In Spanish:

• No tener que + infinitivo typically means "don't have to" — the obligation is removed.
• For "must not" (prohibition), Spanish uses no deber or just a negative imperative.

Tener que in other tenses

Although the present is by far the most common, tener que works in any tense — you just conjugate tener accordingly.

The conditional form tendría que / tendrías que is a workhorse of polite suggestion in Spain — it softens an obligation into advice without invoking the more moralistic deber.

What tener que does NOT do

A few traps for learners:

• Don't omit que. Tener + infinitivo without que is not a construction in Spanish. Tengo estudiar is simply ungrammatical.
• Don't replace que with de. Tener de + infinitivo is archaic at best; today it sounds wrong. (The construction haber de + infinitivo exists with de, but that is a separate, more formal periphrasis.)
• Don't use it for possession. Tener alone means "to have" in the sense of owning (Tengo dos hermanos). The obligation meaning only kicks in with que + infinitivo.

Common Mistakes

Key Takeaways

• Tener que + infinitivo expresses personal obligation: a specific person has to do something. It is the everyday way to say "have to / need to" in peninsular Spanish.
• The structure is rigid: conjugated tener
  • que + infinitive
  . Que is never optional and is never replaced by de or a.
• The conjugation of tener is irregular: tengo, tienes, tiene, tenemos, tenéis, tienen. Memorise these — you will use them constantly.
• Vosotros tenéis is the standard form in Spain for casual plural address.
• Distinguish from hay que (impersonal, general obligation) and deber (more moral or advisory).
• No tener que = "don't have to" (no obligation), not "must not." For prohibitions, use no deber or a negative imperative.
• Pronouns go either before tener (te tengo que decir) or attached to the infinitive (tengo que decirte) — both are correct.
• The conditional tendría que / tendrías que is the polite way to give advice in Spain.