il faut que + Subjunctive

Necessity with Il Faut Que + Subjunctive

Level 3

The expression il faut que is the most common way to say 'I must,' 'you have to,' or 'it is necessary that' in French. It always triggers the subjunctive mood in the following verb.

How It Works

1. The Subjunctive Requirement
Because il faut que expresses a requirement or a will rather than a factual statement, the verb that follows must be in the subjunctive mood. This is non-negotiable in French grammar.

2. Structure
The pattern follows this formula: Il faut que + [Subject] + [Subjunctive Verb].

  • Il faut que je parte. (I must leave.)
  • Il faut que tu fasses attention. (You must be careful.)

3. Specific vs. General
Use this pattern when you want to specify who has the obligation. If you are speaking generally (e.g., 'One must eat to live'), you would use the infinitive instead: Il faut manger pour vivre.

4. Spoken French Nuance
In casual conversation, native speakers often drop the 'il' and just say 'Faut que...'. However, even in casual speech, they almost always maintain the subjunctive verb form, especially for common irregulars like être (sois) or aller (aille).

Examples (5)

  1. Il faut que j'y aille.

    I have to go.

    Word by Word: It is necessary that I there go.

    This uses the irregular subjunctive of 'aller' (aille). It is the standard way to end a conversation in French.

  2. Il faut que tu fasses tes devoirs.

    You must do your homework.

    Word by Word: It is necessary that you do your homework.

    The verb 'faire' changes to 'fasses' in the subjunctive mood after 'il faut que'.

  3. Il faut qu'on en reparle demain.

    We need to talk about it again tomorrow.

    Word by Word: It is necessary that one of-it speak-again tomorrow.

    Even with the informal 'on', the subjunctive is required.

  4. Il faut que vous soyez à l'heure.

    You (plural/formal) must be on time.

    Word by Word: It is necessary that you be at the hour.

    This uses the irregular subjunctive of 'être' (soyez).

  5. Il faudra que nous partions tôt.

    We will have to leave early.

    Word by Word: It will-be-necessary that we leave early.

    The main verb 'falloir' can be conjugated in different tenses (here, the future), but it still triggers the subjunctive.

Common Mistakes

  • Using the indicative mood instead of the subjunctive.

    Il faut que je vais.
    Il faut que j'aille.

    Learners often use the regular present tense (vais) because it's more familiar, but 'il faut que' strictly requires the subjunctive (aille).

  • Dropping the 'que' to mimic English 'must'.

    Il faut tu partes.
    Il faut que tu partes.

    In English, we say 'You must leave' without a connector. In French, 'que' is mandatory to link the impersonal expression to the subject.

  • Trying to use a stressed pronoun directly after 'il faut'.

    Il faut moi partir.
    Il faut que je parte.

    You cannot say 'It is necessary me to leave.' You must use the 'que + subject + subjunctive' structure to specify the person.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

il faut que + SubjunctiveLevel 3Necessity with Il Faut Que + Subjunctive

Learn This First

To use 'il faut que' correctly, you first need to understand the basic concept of expressing necessity with 'il faut'. Since this specific construction triggers the subjunctive mood, you must be able to form the subjunctive. Finally, you need to understand how 'que' functions as a bridge between the impersonal expression and the following clause.

Learn Next

Patterns that build on this one.

Words in This Pattern

falloir