Introduction
Learning Spanish verbs can feel overwhelming at first, but understanding the infinitive form is your gateway to mastering the language. The infinitive serves as the foundation for all verb conjugations and appears constantly in everyday Spanish conversation. Whether you’re planning to travel, advance your career, or simply enjoy Spanish media, grasping how and when to use infinitives will dramatically improve your fluency and confidence.
Understanding the Spanish Infinitive
The infinitive in Spanish represents the basic, unconjugated form of a verb—the form you’ll find listed in dictionaries. Unlike conjugated verbs that change according to tense, mood, and subject, the infinitive remains constant and unchanged. In English, we typically recognize infinitives by the word to before the verb, such as to speak, to eat, or to live. Spanish infinitives don’t require a separate word; instead, they’re identified by their distinctive endings.
The Three Infinitive Endings
Every Spanish infinitive ends in one of three possible ways: -ar, -er, or -ir. These endings determine which conjugation pattern the verb follows throughout all tenses. Recognizing these endings instantly tells you what type of verb you’re working with.
The -ar verbs form the largest group and include common verbs like hablar (to speak), trabajar (to work), and estudiar (to study). When you encounter a new verb ending in -ar, you can predict its conjugation patterns across different tenses.
The -er verbs constitute the second group, featuring frequently used verbs such as comer (to eat), beber (to drink), and aprender (to learn). These verbs follow their own conjugation rules that differ slightly from their -ar counterparts.
The -ir verbs make up the third category and include vivir (to live), escribir (to write), and abrir (to open). While -ir verbs share some conjugation patterns with -er verbs, they maintain distinct differences in certain tenses.
When to Use Spanish Infinitives
Understanding when to use the infinitive rather than a conjugated verb form distinguishes intermediate learners from beginners. Spanish employs infinitives in several specific contexts that don’t always match English usage patterns.
After Conjugated Verbs
One of the most common uses involves placing an infinitive directly after a conjugated verb. Many Spanish verbs naturally pair with infinitives to express intentions, abilities, preferences, or necessities. This construction creates what grammarians call a verbal periphrasis.
The verb querer (to want) always takes an infinitive:
Quiero viajar a España. (I want to travel to Spain.)
¿Quieres comer algo? (Do you want to eat something?)
The verb poder (to be able to/can) requires an infinitive:
Puedo ayudarte mañana. (I can help you tomorrow.)
No podemos llegar tarde. (We cannot arrive late.)
The verb deber (should/must) precedes an infinitive:
Debes estudiar más. (You should study more.)
Debemos salir ahora. (We must leave now.)
The verb necesitar (to need) combines with an infinitive:
Necesito descansar. (I need to rest.)
Necesitamos comprar leche. (We need to buy milk.)
After Prepositions
In Spanish, when a verb follows a preposition, it must always appear in the infinitive form. This rule differs significantly from English, where we often use gerunds (verbs ending in -ing) after prepositions. Mastering this pattern prevents one of the most common mistakes Spanish learners make.
With the preposition para (for/in order to):
Estudio para aprender español. (I study in order to learn Spanish.)
Trabajo para vivir. (I work to live.)
With the preposition de:
Antes de comer, lavamos las manos. (Before eating, we wash our hands.)
Después de trabajar, voy al gimnasio. (After working, I go to the gym.)
With the preposition sin (without):
Salió sin decir adiós. (He left without saying goodbye.)
Pueden entrar sin pagar. (They can enter without paying.)
With the preposition a:
Voy a estudiar esta noche. (I’m going to study tonight.)
Empezó a llover. (It started to rain.)
As the Subject of a Sentence
Spanish uses the infinitive as a noun when the verb itself serves as the subject of the sentence. This usage creates an elegant, concise way to make general statements or express universal truths. English often translates these with gerunds or noun phrases.
Fumar es malo para la salud. (Smoking is bad for your health.)
Viajar amplía tu mente. (Traveling broadens your mind.)
Leer libros mejora el vocabulario. (Reading books improves vocabulary.)
Dormir bien es importante. (Sleeping well is important.)
Notice how the infinitive begins each sentence and functions as a singular noun, even though in English we might use a gerund (-ing form) or translate it differently.
After Impersonal Expressions
Spanish frequently uses the infinitive after impersonal expressions—phrases that don’t refer to a specific person but make general statements. These expressions typically begin with es (it is) followed by an adjective, then the infinitive.
Es importante estudiar todos los días. (It is important to study every day.)
Es necesario practicar la pronunciación. (It is necessary to practice pronunciation.)
Es difícil aprender un idioma nuevo. (It is difficult to learn a new language.)
Es fácil cometer errores. (It is easy to make mistakes.)
Es posible hablar español con fluidez. (It is possible to speak Spanish fluently.)
In Commands and Instructions
The infinitive frequently appears in written instructions, signs, and general commands directed at no one in particular. This usage creates a neutral, impersonal tone perfect for public notices, recipes, manuals, and regulations.
Recipe instructions:
Batir los huevos. (Beat the eggs.)
Calentar el horno a 180 grados. (Heat the oven to 180 degrees.)
Public signs:
No fumar. (No smoking.)
No estacionar. (No parking.)
Empujar. (Push.)
Tirar. (Pull.)
Common Verb Combinations with Infinitives
Certain Spanish verbs form natural partnerships with infinitives, creating common expressions you’ll encounter daily. Learning these combinations as chunks helps you speak more naturally and fluently.
Verbs of Beginning and Ending
Verbs that express starting or stopping an action require an infinitive to complete their meaning:
Empezar a + infinitive (to begin to):
Empecé a estudiar español el año pasado. (I began to study Spanish last year.)
Comenzar a + infinitive (to start to):
El niño comenzó a llorar. (The child started to cry.)
Terminar de + infinitive (to finish):
Terminé de trabajar a las cinco. (I finished working at five.)
Dejar de + infinitive (to stop):
Dejé de fumar hace dos años. (I stopped smoking two years ago.)
Acabar de + infinitive (to have just):
Acabo de llegar a casa. (I have just arrived home.)
Verbs of Obligation and Necessity
These verbs express what must or should happen and always precede an infinitive:
Tener que + infinitive (to have to):
Tengo que terminar este proyecto hoy. (I have to finish this project today.)
Tenemos que levantarnos temprano. (We have to get up early.)
Hay que + infinitive (one must/it is necessary to):
Hay que estudiar mucho para aprobar. (One must study a lot to pass.)
Hay que tener paciencia. (One must have patience.)
Verbs of Desire and Preference
When expressing wants, likes, and preferences with another action, Spanish uses the infinitive:
Desear + infinitive (to wish/desire):
Deseo mejorar mi español. (I wish to improve my Spanish.)
Preferir + infinitive (to prefer):
Prefiero caminar en lugar de correr. (I prefer to walk instead of run.)
Esperar + infinitive (to hope/expect):
Espero viajar a México pronto. (I hope to travel to Mexico soon.)
Special Cases and Exceptions
Like all grammatical rules, the use of infinitives includes some special situations that require extra attention.
Infinitive or Gerund After Ver and Oír
The verbs ver (to see) and oír (to hear) can take either an infinitive or a gerund, with subtle differences in meaning:
Vi a Juan trabajar. (I saw Juan work—the complete action.)
Vi a Juan trabajando. (I saw Juan working—caught in the middle of the action.)
Oí cantar a María. (I heard María sing.)
Oí a María cantando. (I heard María singing.)
Al Plus Infinitive
The construction al + infinitive creates a useful expression meaning upon doing something or when doing something. This structure elegantly connects two simultaneous or consecutive actions:
Al llegar a casa, empezó a llover. (Upon arriving home, it started to rain.)
Al ver a su amiga, sonrió. (When she saw her friend, she smiled.)
Al terminar el libro, lo cerré. (Upon finishing the book, I closed it.)
Infinitives in Idiomatic Expressions
Many common Spanish phrases and idioms incorporate infinitives in ways that don’t translate literally to English. Learning these expressions helps you sound more natural and culturally fluent.
Echar a + infinitive (to start suddenly):
Echó a correr. (He started running suddenly.)
Volver a + infinitive (to do again):
Volvió a llamar. (He called again.)
Ponerse a + infinitive (to start/begin):
Se puso a estudiar inmediatamente. (He started studying immediately.)
Llegar a + infinitive (to manage to/succeed in):
Llegó a ser director. (He managed to become director.)
Practical Tips for Mastering Infinitives
Developing comfort with infinitives takes practice and exposure. Here are strategies to accelerate your learning:
First, create flashcards pairing common verbs with infinitives they require. Focus on high-frequency combinations like querer + infinitive, poder + infinitive, and tener que + infinitive. Review these daily until they become automatic.
Second, pay attention to infinitives when reading Spanish texts, whether articles, books, or social media posts. Notice how native speakers use them naturally and in what contexts. Highlight or note interesting examples to review later.
Third, practice constructing your own sentences using different infinitive patterns. Start with simple statements like Necesito estudiar and gradually build complexity by adding time expressions, locations, or additional details.
Fourth, listen actively to Spanish podcasts, songs, or videos, focusing on catching infinitives in natural speech. Native speakers use these constantly, so training your ear helps tremendously.
Fifth, remember that mistakes are part of learning. If you accidentally use a gerund where an infinitive belongs, or vice versa, simply correct yourself and move forward. Each error helps solidify the correct pattern in your mind.
Common Mistakes to Avoid
Understanding typical errors helps prevent them before they become habits:
One frequent mistake involves using gerunds after prepositions, influenced by English patterns. Remember: Spanish always requires the infinitive after prepositions. Say antes de comer (before eating), never antes de comiendo.
Another common error involves conjugating verbs that should remain in the infinitive form after modal verbs. After querer, poder, or deber, keep the second verb unconjugated: Quiero comer (I want to eat), not Quiero como.
Some learners incorrectly try to make infinitives plural to match plural subjects. Infinitives never change form regardless of who performs the action or how many people are involved. Estudiar es importante remains correct whether one person or many people are studying.
Building Your Infinitive Vocabulary
As you expand your Spanish skills, prioritize learning common infinitives in each category. Start with these essential verbs:
Essential -ar verbs: hablar (to speak), trabajar (to work), estudiar (to study), viajar (to travel), comprar (to buy), usar (to use), mirar (to look), escuchar (to listen), caminar (to walk), cocinar (to cook).
Essential -er verbs: comer (to eat), beber (to drink), leer (to read), aprender (to learn), vender (to sell), correr (to run), entender (to understand), creer (to believe), ver (to see), hacer (to do/make).
Essential -ir verbs: vivir (to live), escribir (to write), recibir (to receive), decidir (to decide), abrir (to open), subir (to go up), compartir (to share), permitir (to permit), existir (to exist), salir (to leave/go out).
Mastering these foundational infinitives gives you the building blocks to express countless ideas and construct increasingly sophisticated sentences.
Conclusion
The Spanish infinitive forms an indispensable part of the language that you’ll use in virtually every conversation. By understanding when and how to employ infinitives—after conjugated verbs, following prepositions, as sentence subjects, in impersonal expressions, and within idiomatic phrases—you equip yourself with tools for clearer, more natural Spanish communication. Practice these patterns consistently, remain attentive to how native speakers use infinitives, and your confidence will grow steadily as these structures become second nature in your Spanish journey.
