Infinitive of Purpose: Why We Use 'To' + Verb (A2 English Grammar) — A2 English grammar lesson by Langcom

Infinitive of Purpose: Why We Use ‘To’ + Verb (A2 English Grammar)

Raúl Maguiña

Fundador de Langcom | Examinador de Cambridge y del SIELE

septiembre 14, 2026

A2✏️ Gramática⏱️ 4 minutos de lectura📅 Updated septiembre 2026
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The infinitive of purpose tells you *why* someone does something. We use the structure to + base form of the verb to explain the reason or goal of an action. For example, if you say I went to the shop to buy milk, the phrase to buy milk explains *why* you went to the shop. This grammar point is very common in everyday English and helps you communicate your intentions clearly. It’s like answering the question “Why?” for an action. You might go to a cafe to meet friends, or study hard to pass an exam. It helps connect two ideas: the action you take and the reason for that action. This structure is essential for A2 learners to express their intentions and purposes simply and effectively. Mastering this will make your English sound more natural and precise, improving your ability to describe daily activities and plans.

What is the Infinitive of Purpose?

The infinitive of purpose is a grammar structure that explains the *reason* or *goal* behind an action. It answers the question “Why?”

  • We form it with to followed by the base form of a verb.
  • For example, if you ask Why did you call me?, the answer could be I called you to ask about the party. Here, to ask is the infinitive of purpose.

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How Do We Use the Infinitive of Purpose?

We use this structure to show the intention or aim of an action. It often follows verbs that describe movement or activity.

  • You can use it after verbs like go, come, travel, study, call, buy, and many others.
  • Think of it as explaining the *purpose* of the main verb in the sentence.
  • For instance, She went to the library to borrow a book. (to borrow a book is the reason she went).

Infinitive of Purpose vs. Other Uses of 'To'

La palabra to has many uses in English. It can be a preposition or part of an infinitive verb.

  • When to is followed by the base form of a verb and explains *why* something happens, it is the infinitive of purpose.
  • Ejemplo: I study English to get a better job. (Purpose)
  • Be careful not to confuse it with to as a preposition, like in I go to school (here school is a noun).
  • Also, some verbs are followed by to + infinitive as part of their structure, like I want to learn. This is not always purpose. The key is asking "Why?".
Comparing 'To' for Purpose and 'For' for Purpose
Structure What it explains Example
To + base verb The reason for an action I went to the library to study.
For + noun The purpose of an object or thing This machine is for making coffee.

Ejemplos

  • I went to the supermarket to buy some fruit.
  • She called her friend to invite her to the party.
  • He studies hard to pass his exams.
  • They traveled to Spain to learn Spanish.
  • We stopped the car to take a picture.

Práctica

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Errores habituales de los hispanohablantes

Spanish speakers often make a common mistake by using for + -ing o for + noun when they mean purpose with a verb.

  • Incorrecto: I went to the library for studying.
  • Correcto: I went to the library to study.
  • Incorrecto: She bought a new phone for calls. (While for calls is grammatically possible, to make calls is the common way to express purpose with a verb.)
  • Correcto: She bought a new phone to make calls.

Remember, for purpose with a verb, always use to + base form of the verb.

Preguntas más frecuentes

What is the infinitive of purpose?

It is a grammar structure using to + the base form of a verb. It explains the reason or goal for an action. For example, I exercise to stay healthy.

Can I use 'for' instead of 'to' for purpose?

Se utiliza to + base verb for purpose with an action (e.g., I read to learn). You can use for + noun to talk about the purpose of an object (e.g., This pen is for writing), but not for + -ing verb when explaining the purpose of an action.

How is the infinitive of purpose important for the A2 Key exam?

In the A2 Key (KET) exam, you need to communicate clearly. Using the infinitive of purpose correctly, for example, in writing tasks like I'm writing to ask about... o I want to meet to discuss..., helps you express your intentions and reasons accurately, which is important for a good score.

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Sobre el autor: Raúl Maguiña

Raúl Maguiña es el director de la Asociación Educativa Langcom, un centro autorizado de preparación para el examen Cambridge English en tu país. Con más de una década de experiencia en la enseñanza de idiomas y la certificación internacional, ha ayudado a miles de estudiantes, profesores e instituciones educativas de 25 países a conseguir las certificaciones de inglés de Cambridge, IELTS, TOEFL y Michigan.

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