The Complete Guide to the French Infinitive

One of the first things you’ll learn in French are infinitive verbs. You begin with verbs like être (to be) and avoir (to have), in their unconjugated, original form.

Shortly after, you begin to conjugate the verbs and incorporate them into complete sentences with all the new vocabulary you’ve learned.

While conjugating verbs is an important part of communicating in the French language, the French infinitive has many uses.

In this post, we’ll teach you what the French infinitive is and when you can use it.


What is the French Infinitive?

The French infinitive is the unconjugated form of a verb. In English, infinitive verbs are “to + _____” verbs, like “to learn” in English (apprendre in French).

Without being conjugated, this infinitive form only tells you what is happening, but gives no further information, such as who is carrying out the action or the time frame in which it is taking place. 

In French, unconjugated verbs end in either -er, -re or -ir

As counter-intuitive as it may seem, unconjugated verbs are not just a thing of your early French-learning days. The French infinitive is actually rather versatile and unconjugated French verbs have a variety of uses.

Let’s take a look at the uses of the French infinitive. 

When to Use the French Infinitive

1. After a conjugated verb

In French, two conjugated verbs in a row is a no-no (or should I say a non-non). So, for example, if you want to say “I like to run,” only the verb aimer (to like) would be conjugated:

J’aime courir. (I like to run.)

Dual-verb constructions are constructions that are formed with a semi-auxiliary verb such as aller (to go), devoir [faire quelque chose] (to have to [do something]), espérer (to hope/wish), promettre (to promise) or vouloir  (to want to), followed by another verb in the infinitive:

Nicole voudrait dormir. (Nicole would like to sleep.)

When using the infinitive with conjugated verbs, pronouns and different constructions within the same sentence in French, it’s important to be mindful of the word order:

  • Object, reflexive and adverbial pronouns are usually placed between the two verbs and after the preposition (if there is one) that follows the conjugated verb:

Caroline doit se laver les mains. (Caroline must wash her hands.)

  • Object, reflexive and adverbial pronouns all precede the infinitive in sentences in French:

Il faut s’habiller. (You must get dressed.)

  • Negative constructions should surround the conjugated verb and precede the preposition, if there is one:

Jean ne va pas manger ce soir. (Jean is not going to eat tonight.)

  • Both elements of a negative construction precede the infinitive:

Ne jamais laisser la fenêtre ouverte. (Never leave the window open.)

  • In the case of a sentence that contains both pronouns and a negative construction, the negative construction precedes the pronouns:

Ne jamais la laisser ouverte. (Never leave it open.)

2. As a noun (the subject/object of a sentence)

As a noun, the French infinitive is translated as the English present participle when it’s employed as a noun.

Prévenir, c’est guérir. (Preventing is healing.)

Lire, c’est voyager. (Reading is traveling.)

Apprendre le chinois est difficile. (Learning Chinese is difficult.)

3. After a preposition

In French, there are many verbs that must be accompanied by a preposition—most commonly à  (at, to) or de  (from, of). If an additional verb is required to make a sentence meaningful, it must be employed in the infinitive.

C’est difficile de discuter avec Adrien. (It’s difficult to talk to Adrien.)

Avant de manger, je me lave les mains. (Before eating, I wash my hands.)

4. In place of the imperative

The imperative mood is most commonly used in French to give commands. The French infinitive can be used in its place when a command is impersonal in nature. This means you’ll come across the infinitive in the context of warnings as well as in instruction manuals and in recipes.

Mettre un casque de sécurité. (Put on a safety helmet.)

Verser la farine dans le saladier. (Pour the flour in the mixing bowl.)

5. In an interrogative or exclamative phrase

The French infinitive can be used to construct interrogative or exclamative phrases in the context of a dilemma:

Que faire ? (What to do?)

Où aller ? (Where to go?)

Quelle couleur choisir ? (Which color to choose?)

6. In place of the subjunctive

The French infinitive can be used in place of the subjunctive mood in two instances.

  • When the subject of the main clause and the subordinate clause is the same:

The sentence Elise est contente qu’elle soit à l’heure (Elise is happy that she is on time) can be rewritten using the infinitive as Elise est contente d’être à l’heure  (Elise is happy to be on time).

(In a case like this, you’re actually required to use the infinitive because in the first example, elle would refer to someone else, not Elise.)

  • When the subject is implied but not explicitly stated:

The sentence Il faut que tu dormes  (You must sleep) can be written using the infinitive as Il faut dormir  (You must sleep).

7. To form the past infinitive

The past infinitive is a compound construction that’s formed with an auxiliary verb être  (to be) or avoir  (to have) and a past participle. The past infinitive denotes an action that occurs before the action of the main verb. The past infinitive is used in four instances.

  • Modifying the verb in the main clause:

J’aurais préféré avoir mangé plus tôt. (I would have preferred to have eaten earlier.)

  • Modifying the adjective in the main clause:

Elise est contente d’avoir déménagé. (Elise is happy to have moved.)

  • Following the preposition après (after):

Après avoir mangé, j’étais moins énérvé. (After having eaten, I was less annoyed.)

  • Expressing gratitude: 

Merci de m’avoir invité. (Thank you for having invited me.)

A note on word order and the past infinitive: In day-to-day French, negative constructions precede the infinitive.

Je suis désolé(e) de ne pas être arrivé à l’heure. (I am sorry for not having arrived on time.)

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Beyond the Basics: How to Make the Most of the French Infinitive

  • Quiz yourself. Correctly employing the French infinitive requires you to acquire a firm grasp on verb-pronoun pairings. While many such pairings exist in English, learners of the French language must remain aware that different pronouns are used in each language.

Check out these flashcards from Quizlet to practice determining whether verbs are followed by the preposition à (to, from), de (from, of) or the infinitive. Once you’re comfortable with those, take this fill-in-the-blank preposition quiz. Finally, this quiz from Tex’s French Grammar is a great way to brush up on your translation skills while you fine-tune your understanding of the infinitive.

  • Listen for it. Another great way to learn and practice the French infinitive is to listen to or watch French content to see where you can hear it being used in different contexts by native speakers. If you can find accompanying texts, even better.

501 French Verbs (Barron's 501 Verbs)

A great way to do this is to classify the verbs that you come across as those which are followed by the prepositions à (at, to) and de (of, from) or nothing at all. The reference guide “501 French Verbs” is also a great resource for finding le mot juste (the right word) or perhaps I should say le verbe juste (the right verb)?

  • (Re)write text in French. A simple but effective exercise to get comfortable with the various uses of the infinitive (and improve your reading comprehension) is to take a paragraph from a book or another short- to medium-length text (a newspaper or magazine article are also good options) and where applicable, replace existing constructions with the French infinitive.


Quelle méthode choisir ? (What method to choose?)

Well, it’s up to you!

Pratiquer souvent (practice often) and your French will improve.

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