Infinitive Verbs in Spanish | Use Them With Confidence

Spanish learners meet infinitives early: hablar, comer, vivir. They look simple, but they power a huge chunk of everyday Spanish. Spot an infinitive fast, and you’ll build sentences with less strain and fewer “Wait… which verb form goes here?” moments.

This article breaks down what infinitives are, when Spanish keeps a verb in the infinitive form, and the sentence patterns that show up in real speech. You’ll get clean examples, common slip-ups to avoid, and short drills you can reuse.

What An Infinitive Verb Means In Spanish

An infinitive is the dictionary form of a verb. It names an action or state without telling you who does it or when it happens. In English, it often matches “to + verb” (to eat, to live). In Spanish, it’s usually one word: comer, vivir.

Spanish infinitives can behave like verbs, and they can also act like nouns. That mix is why they appear in so many sentence types.

How To Recognize Spanish Infinitive Endings

Spanish infinitives end in one of three groups:

• -ar (hablar, estudiar, trabajar)
• -er (comer, aprender, beber)
• -ir (vivir, escribir, abrir)

If you see one of those endings and the verb isn’t changed for a subject, you’re almost always looking at an infinitive.

Infinitive Vs Conjugated Verb

A conjugated verb changes to match the subject: yo hablo, tú comes, ella vive. An infinitive does not change: hablar, comer, vivir. When Spanish needs person, number, tense, or mood, it conjugates. When it doesn’t, it often keeps the infinitive.

Infinitive Verbs in Spanish With Another Verb

One of the most common patterns is a conjugated verb followed by an infinitive. The first verb carries the tense and the subject. The infinitive carries the action that follows.

After Verbs Of Wanting, Liking, And Needing

These verbs point to another action, so Spanish links them to an infinitive.

• Quiero comer ahora.
• Necesitamos estudiar esta noche.
• A ella le gusta leer.

The subject is already set by the first verb (quiero, necesitamos, le gusta). The second action stays in the infinitive.

After Verbs Of Starting And Stopping

Spanish often uses an infinitive after verbs that mark the start or end of an action.

• Empiezo a trabajar a las ocho.
• Dejó de fumar.

Many of these verbs pair with a preposition (a, de). That matters, since prepositions often signal an infinitive next.

When The Subject Changes

If the second action has a different subject, Spanish often switches to a clause with que plus a conjugated verb.

• Quiero salir. (I want to leave.)
• Quiero que tú salgas. (I want you to leave.)

One fast rule: same subject often allows an infinitive; new subject often needs que + conjugation.

Using Spanish Infinitive Verbs After Prepositions

After a preposition, Spanish uses an infinitive when the next word is an action. English often uses “-ing” in this spot. Spanish keeps the infinitive.

Common Prepositions That Trigger An Infinitive

• a: Voy a estudiar.
• de: Antes de salir, cierro la puerta.
• para: Estudio para pasar el examen.
• por: Gracias por ayudar.
• sin: Salió sin decir nada.

If you can hear the preposition, you can often predict the infinitive that follows it.

Antes De, Después De, And Al + Infinitive

Time expressions love infinitives:

• Antes de comer, me lavo las manos.
• Después de terminar, te llamo.
• Al llegar, mando un mensaje.

Al + infinitive can sound like “upon doing” or “when doing.” You’ll hear it in speech and see it in writing.

Where Spanish Uses An Infinitive Instead Of A Noun

Spanish can turn an infinitive into “the act of doing something,” so it can fill noun slots like subject or object.

Infinitive As The Subject

• Aprender español toma tiempo.
• Dormir ocho horas ayuda.

You can add an article to make it feel more noun-like: El fumar es malo para la salud. In casual speech, you’ll often hear a normal noun instead (el cigarro), but the infinitive form is still correct.

Infinitive As The Direct Object

• Odio esperar.
• Prefiero caminar.

These are compact and natural. There’s no need to repeat the subject when it stays the same.

Here’s a set of common infinitives you can reuse when building practice sentences. Swap subjects, add time phrases, and change the object to stretch your range.

Infinitive	Meaning	Sentence Starter
hablar	to speak	Quiero hablar de…
comer	to eat	Necesito comer antes de…
vivir	to live	Me gustaría vivir en…
hacer	to do / make	Tengo que hacer…
ir	to go	Voy a ir a…
tener	to have	Quiero tener…
poner	to put	Voy a poner…
decir	to say / tell	Necesito decirte…
ver	to see	Quiero ver si…
dar	to give	Te voy a dar…
sentir	to feel	Me encanta sentir…
usar	to use	Puedo usar… para…

Verb Combos That Use Infinitives In Daily Spanish

Spanish often expresses ideas like “going to,” “having to,” or “just did” with a helper verb plus an infinitive. These combos appear constantly in conversation.

Ir A + Infinitive

This is the everyday future for plans and near-future actions.

• Voy a estudiar después de cenar.
• ¿Vas a venir mañana?

It’s direct: conjugate ir, then add the action as an infinitive.

Tener Que + Infinitive

Use this for obligations, tasks, and requirements.

• Tengo que trabajar hoy.
• Tenemos que salir temprano.

Acabar De + Infinitive

This expresses a recent past action: “to have just done.”

• Acabo de llegar.
• Acabamos de comer.

Modal Verbs + Infinitive

Modals link straight to an infinitive:

• Puedo ayudarte ahora.
• Debes leer las instrucciones.
• Quieren viajar en verano.

The infinitive carries the main action, while the first verb adds permission, duty, or desire.

Pronouns With Infinitives

Object pronouns can attach to an infinitive as a single unit, which is one reason infinitives feel tidy in writing.

Where To Place Object Pronouns

With a conjugated verb + infinitive, you usually have two natural choices:

• Lo quiero comprar.
• Quiero comprarlo.

Both work. When you attach pronouns to the infinitive, keep the order right (me, te, se, lo/la, le, nos, os, los/las).

Double Pronouns With An Infinitive

• Voy a dártelo.
• Necesito decírselo.

When le or les meets lo/la/los/las, it changes to se: decírselo, not decírlelo.

Accent Marks When Attaching Pronouns

Some infinitives gain an accent mark when you attach pronouns, so the stress stays where Spanish expects it: dar → dártelo, decir → decírselo. Reading aloud often makes the stress pattern clear.

Pattern	Meaning	Model Line
ir a + infinitive	plan / near future	Voy a estudiar.
tener que + infinitive	obligation	Tengo que llamar.
acabar de + infinitive	just did	Acabo de salir.
volver a + infinitive	do again	Vuelvo a intentarlo.
empezar a + infinitive	begin	Empiezo a escribir.
dejar de + infinitive	stop	Dejo de fumar.
aprender a + infinitive	learn to	Aprendo a conducir.
ayudar a + infinitive	help to	Te ayudo a cocinar.
preferir + infinitive	prefer to	Prefiero caminar.

Common Mistakes With Spanish Infinitives

Most errors come from copying English patterns. Fixing them is mainly pattern practice.

Mistake 1: Conjugating After A Preposition

Wrong: Antes de salgo. Right: Antes de salir. After a preposition, keep the infinitive unless you switch to a full clause with a new subject.

Mistake 2: Using A Noun Where You Need An Action

Spanish needs an infinitive to show an action: para estudiar, not para estudio. A noun works when you truly mean a thing: para el estudio (for study as a topic), but that’s less common in everyday lines.

Mistake 3: Mixing Up Infinitive And Gerund

English uses “-ing” after many verbs and after prepositions. Spanish uses the infinitive after prepositions. The gerund (-ando/-iendo) appears in other places, like with estar: Estoy estudiando.

Mistake 4: Forgetting Subject Change

When the doer changes, many learners keep the infinitive and end up with a sentence that feels off. Use que + conjugation when needed: Quiero que ella venga.

Practice Drills You Can Reuse

Practice works best when you repeat a small set of patterns until they feel automatic. Use the drills below for speaking, writing, or review before a test.

Drill A: Conjugated Verb + Infinitive

1. Pick a starter verb: quiero, necesito, puedo, debo.
2. Add an infinitive from the first table.
3. Add a time phrase: hoy, mañana, esta noche, después de clase.

Sample build: Necesito comer después de clase. Swap the starter verb and keep the rest to lock in the shape.

Drill B: Preposition + Infinitive

1. Pick a preposition: antes de, después de, para, sin, al.
2. Add an infinitive that fits the meaning.
3. Add a short second clause if you want more length.

Sample build: Antes de salir, reviso mi mochila.

Drill C: Pronouns Attached To Infinitives

1. Pick a verb that can take an object: comprar, decir, dar, traer.
2. Add a direct object pronoun: lo, la, los, las.
3. Attach it to the infinitive or place it before the first verb.

Sample build: Voy a comprarlo / Lo voy a comprar.

How To Choose The Right Infinitive Fast

When you’re speaking, you rarely have time to think about grammar labels. A simple set of checks can help you decide fast.

• If you hear a preposition, expect an infinitive next.
• If you already conjugated a verb and the subject stays the same, the next verb often stays in the infinitive.
• If the doer changes, expect que + a conjugated verb.
• If you need “the act of doing,” an infinitive can fill a noun slot.

Run those checks, then speak. If you stumble, rebuild the line with a starter you trust: quiero, tengo que, or voy a. Those starters give you a clean opening and a clear landing spot for the infinitive.

Mini Self Check

Try these without looking back. Then compare to the answer lines.

1. Translate: “Before leaving, I call my mom.”
2. Complete: “Voy a ____ (to study) después de cenar.”
3. Fix the error: “Gracias por ayudas.”
4. Choose: “Quiero (salir / salgo) ahora.”

• 1) Antes de salir, llamo a mi mamá.
• 2) Voy a estudiar después de cenar.
• 3) Gracias por ayudar.
• 4) Quiero salir ahora.

Next Steps To Make Infinitives Feel Natural

Pick five infinitives you use often and build ten sentences with each. Say them out loud, then add pronouns and time phrases. That repetition makes the forms stick without extra fuss.

If you keep one rule in mind, use this: Spanish often chooses the infinitive when the subject is already clear and the verb sits after another verb or a preposition. Once that clicks, many verb choices stop feeling random.