How to use Spanish infinitives after basic helping verbs

Introduction

Learning when to use infinitives after helping verbs is one of the first building blocks in Spanish. This article explains the most common helping verbs, shows clear patterns, and gives practical beginner examples you can use in everyday situations like ordering food, making plans, or giving simple requests.

What is a Spanish infinitive?

A Spanish infinitive is the basic form of a verb before it is conjugated. Infinitives end in -ar, -er, or -ir. Examples: hablar, comer, vivir. In English, infinitives often appear with to, like to speak, to eat, to live.

What counts as a helping verb?

Helping verbs (also called auxiliary verbs) are verbs that combine with an infinitive to add meaning about ability, obligation, desire, intention, permission, or immediate future. In beginner Spanish the most common ones are: poder (can), querer (want), tener que (have to/need to), ir a (going to), deber (should/ought to), and modal expressions like hay que (one must/it is necessary).

Basic pattern: conjugated helping verb + infinitive

The core rule is simple: conjugate the helping verb for the subject, and keep the second verb in the infinitive form. Do not conjugate the second verb. Example pattern:

Subject + [conjugated helping verb] + [infinitive]

Yo + puedo + comer → Yo puedo comer

Usted + quiere + hablar → Usted quiere hablar

Why the infinitive stays unchanged

The infinitive expresses the action itself. The helping verb carries the grammatical information like person, number, tense, and mood. This separation makes sentences clearer and simpler for beginners.

Common helping verbs and examples

Below are key helping verbs with explanations and practical examples you can use immediately.

poder — ability or permission

poder means can, to be able to, or may (permission). Conjugate poder and follow with an infinitive.

Yo puedo estudiar — I can study

Tú puedes ayudarme — You can help me

¿Puede entrar? — Can you come in? / May you enter?

Common beginner tip: Use poder for both ability and polite requests. For permission with strangers, use formal form: ¿Puede…?

querer — desire or want

querer expresses desire or preference. It is frequently used to order food or make simple plans.

Yo quiero agua — I want water

Ella quiere comer ahora — She wants to eat now

Quiero aprender español — I want to learn Spanish

tener que — obligation or necessity

tener que + infinitive means to have to or must. Conjugate tener and keep que before the infinitive.

Tengo que estudiar — I have to study

Tenemos que salir temprano — We have to leave early

Note: Do not say *tengo que iro* — the correct form is tengo que ir.

ir a — near future (going to)

ir a + infinitive indicates a planned or imminent action like English going to. Conjugate ir and add a, then the infinitive.

Voy a comer — I am going to eat

Vas a estudiar más tarde — You are going to study later

Vamos a viajar mañana — We are going to travel tomorrow

deber — should, ought to

deber expresses recommendation or moral obligation. Use it for advice or polite suggestions.

Debes descansar — You should rest

Debemos practicar todos los días — We should practice every day

hay que — general necessity

hay que is impersonal and means one must or it is necessary to. It is never conjugated for person.

Hay que leer las instrucciones — One must read the instructions

Hay que pagar antes — You must pay before

Practical everyday examples

Here are short dialogues and common sentences you might see in daily life. Notice how each helping verb is conjugated and the second verb remains infinitive.

At a restaurant:

Quiero ordenar una sopa — I want to order a soup
¿Puede traer la cuenta? — Can you bring the check?

Making plans:

Voy a llamar a María esta tarde — I am going to call María this afternoon
Tengo que trabajar mañana — I have to work tomorrow

Asking permission:

¿Puedo entrar? — May I come in?
¿Puedo usar su baño? — Can I use your bathroom?

Giving advice:

Debes dormir más — You should sleep more
Hay que practicar la pronunciación — One must practice pronunciation

Negative forms and common structures

Negation is simple: place no before the conjugated helping verb. The infinitive still stays unchanged.

No puedo hablar ahora — I cannot talk now

No quiero comer eso — I do not want to eat that

No vamos a salir hoy — We are not going to leave today

Short commands and polite requests

Beginners often ask how to make polite requests. Two common ways:

Use conditional or polite modal: ¿Podría traer agua? — Could you bring water?

Use the infinitive with hay que for general signs or instructions: Hay que limpiar después de usar — You must clean after using

Common mistakes and how to avoid them

Beginners make predictable errors. Here are the top ones and simple fixes.

Mistake: Conjugating the second verb
Wrong: Quiero comeré — Correct: Quiero comer

Fix: Remember only the helping verb changes by person and tense. The second verb stays in infinitive form.

Mistake: Forgetting que after tener
Wrong: Tengo salir — Correct: Tengo que salir

Fix: Always include que after tener when expressing obligation.

Mistake: Using infinitive after prepositions without adjusting context
Wrong: Voy a la tienda comprar — Correct: Voy a la tienda a comprar or Voy a comprar en la tienda

Fix: Insert the preposition a or rearrange the sentence to keep it natural.

Practice activities for beginners

Short exercises help internalize the pattern. Try these simple activities daily.

Activity 1: Fill the blank with the correct infinitive form
Yo puedo ___ (hablar) — Yo puedo hablar

Activity 2: Convert plans into ir a sentences
Example: I will study tonight → Voy a estudiar esta noche

Activity 3: Make polite requests using puede/puedo/puede usted
Write three questions like ¿Puede traer…?, ¿Puedo ver…? and practice aloud.

Useful vocabulary and phrases

Basic verbs in infinitive to memorize for building sentences:

hablar — to speak

comer — to eat

beber — to drink

ir — to go

estudiar — to study

trabajar — to work

Helpful short phrases with helping verbs:

¿Puedo ayudar? — May I help?

Quiero esto — I want this

Tengo que irme — I have to leave

Quick reference chart (memory-friendly)

Pattern: [Subject] + [conjugated modal] + [infinitive]

Examples: Yo puedo + estudiar, Tú quieres + comer, Nosotros vamos a + salir, Ella debe + descansar

Tips for rapid improvement

1. Make small goal-driven sentences. Use only one helping verb plus one infinitive, for example, Voy a leer.

2. Practice with real-life tasks: order in Spanish, ask simple questions, state your plans.

3. Listen for helping verbs in simple audio or short videos and identify the infinitives that follow.

Additional beginner-friendly examples

Short realistic situations you may encounter:

At a café: Quiero un café con leche — I want a coffee with milk

On a schedule: Mañana voy a trabajar a las ocho — Tomorrow I am going to work at eight

At a service counter: ¿Puedo pagar con tarjeta? — Can I pay with card?

Conclusion

Using Spanish infinitives after basic helping verbs is straightforward: conjugate the helping verb, leave the second verb in its infinitive, and add words like que or a as needed. Practice short, realistic sentences with poder, querer, tener que, ir a, and deber to build confidence. With focused repetition in everyday contexts you will quickly start forming correct and useful sentences.