Doubt requires the subjunctive

Level 3

When you express doubt using verbs like douter que (to doubt that) or il est peu probable que (it is unlikely that), the verb in the following clause must be in the subjunctive mood.

How It Works

In French, the choice between the indicative (facts) and the subjunctive (possibility/doubt) depends on the main verb.

1. The Trigger:
Verbs like douter que (to doubt that) or impersonal expressions like il est douteux que (it is doubtful that) always trigger the subjunctive because they explicitly deny the certainty of the action.

2. The 'Que' Connection:
The subjunctive appears in the subordinate clause introduced by que. Crucially, the subject of the main clause must be different from the subject of the subordinate clause. If they are the same, use an infinitive instead (e.g., Je doute de pouvoir venir).

3. The Negation Shift:
When you negate a verb of doubt (Je ne doute pas que...), you are expressing certainty. In modern French, this often triggers the indicative mood. In formal writing, you might see a ne explétif added (e.g., Je ne doute pas qu'il ne vienne), though it doesn't change the meaning.

4. Negated Opinion Verbs:
While verbs like penser or croire take the indicative in positive sentences, they trigger the subjunctive when negated or used in questions because they no longer express a firm belief (e.g., Je ne pense pas qu'il vienne).

5. Probability vs. Improbability:
There is a subtle contrast with probability. Il est probable que takes the indicative because it suggests a high likelihood. However, il est peu probable que (it is unlikely that) introduces enough doubt to require the subjunctive.

6. Se Douter vs. Douter:
Be careful with the reflexive verb se douter. While douter means 'to doubt' (subjunctive), se douter means 'to suspect' or 'to have a hunch' (indicative).

Examples (4)

  1. Je doute qu'elle vienne à la fête ce soir.

    I doubt that she is coming to the party tonight.

    Word by Word: I doubt that she comes to the party this evening.

    The verb 'vienne' is the subjunctive form of 'venir' because it follows 'je doute que'.

  2. Il est peu probable qu'il sache la réponse.

    It is unlikely that he knows the answer.

    Word by Word: It is little probable that he knows the answer.

    The expression 'il est peu probable que' indicates uncertainty, requiring the subjunctive 'sache' (from savoir).

  3. Je ne doute pas qu'il réussira son examen.

    I don't doubt that he will pass his exam.

    Word by Word: I not doubt not that he will succeed his exam.

    When 'douter' is negated, it expresses certainty, so the indicative (future tense 'réussira') is commonly used.

  4. Je me doute qu'il est déjà au courant.

    I suspect that he is already aware.

    Word by Word: I myself doubt that he is already at the current.

    The reflexive 'se douter' means 'to suspect' and takes the indicative 'est' because it implies a belief that something is true.

Common Mistakes

  • Using the indicative after 'douter que'.

    Je doute qu'il vient.
    Je doute qu'il vienne.

    Even if you think the person is definitely not coming, the grammatical trigger 'douter' requires the subjunctive mood.

  • Using the subjunctive after 'se douter que'.

    Je me doute qu'il soit là.
    Je me doute qu'il est là.

    'Se douter' (to suspect) is not a verb of doubt; it is a verb of 'hunch' or 'supposition,' which takes the indicative.

  • Using the subjunctive after 'sans doute'.

    Sans doute qu'il pleuve.
    Sans doute qu'il pleut.

    Despite its literal appearance, 'sans doute' actually means 'probably' in French and is followed by the indicative.

How It Connects

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

Doubt requires the subjunctiveLevel 3

Learn This First

To learn the use of the subjunctive after verbs of doubt, you must first understand how to form the present subjunctive and how the conjunction 'que' connects a main clause to a subordinate clause. It is also helpful to have experience with other subjunctive triggers, such as expressions of desire, to understand the general logic of when this mood is required.