After expressions of doubt, denial, and rejection, Catalan commonly places the disputed proposition in the subjunctive: Dubto que arribi a temps “I doubt he'll arrive on time.” The subjunctive marks that the speaker is not committing to the dependent clause as a fact. Affirmative belief, recognition, and knowledge normally do the opposite and therefore take the indicative.
English does not visibly change the verb in most of these clauses. “I think she knows” and “I don't think she knows” both contain knows; Catalan contrasts Crec que ho sap with No crec que ho sàpiga. The meaning of the main clause controls whether the proposition is asserted.
For the broader system beyond doubt and denial, see choosing between indicative and subjunctive.
Direct doubt with dubtar
Dubtar que places the whole following proposition in question and normally selects the subjunctive. The doubted event can concern the present or the future; the present subjunctive covers both.
Dubto que aquest carregador funcioni amb el teu ordinador.
I doubt this charger works with your computer.
Dubtem que acabin les obres abans de juny.
We doubt they will finish the construction work before June.
La metgessa dubta que el dolor tingui relació amb la dieta.
The doctor doubts that the pain is related to the diet.
If the speaker removes the doubt, the proposition can again be presented assertively, and the indicative is expected:
No dubto que trobaràs una solució.
I have no doubt that you will find a solution.
This pair demonstrates why a memorized word-trigger rule is inadequate. Dubtar does not mechanically demand the subjunctive under all polarity. Affirmative dubto withholds commitment; no dubto normally communicates confidence.
Belief verbs under negation
Affirmative creure, pensar, and imaginar-se normally introduce an assertion and therefore take the indicative. When they are negated, Catalan commonly uses the subjunctive because the speaker declines to endorse the complement.
Crec que la Núria ja és a casa.
I think Núria is home already.
No crec que la Núria sigui a casa encara.
I don't think Núria is home yet.
No ens imaginem que puguin apujar el lloguer una altra vegada.
We don't imagine they can raise the rent again.
The contrast is not “positive sentence versus negative sentence” in general. Negating a verb of knowledge does not make the subordinate fact disappear from the speaker's discourse:
Ell no sap que demà tanquen l'oficina.
He doesn't know that the office is closing tomorrow.
The subject ell lacks the information, but the speaker presents demà tanquen l'oficina as true. That is why the indicative remains natural. Similarly, No he dit que vindré can simply deny having made a statement while still leaving the speaker's arrival open; mood depends on whether the complement itself is rejected, not merely whether the main clause contains no.
Denial and rejection
With negar que, the speaker rejects the truth of the complement, so the subjunctive is the regular choice.
L'empresa nega que les dades siguin incompletes.
The company denies that the data are incomplete.
Nego que jo li hagi promès res.
I deny that I promised him anything.
The second sentence uses the present perfect subjunctive because the alleged promise precedes the denial. Present sigui in the first sentence describes a state simultaneous with the denial. Tense locates the event; mood shows the speaker's stance toward its truth.
Rebutjar can reject an action, proposal, or state of affairs rather than merely deny a factual claim. A finite rejected course of action is naturally nonasserted and takes the subjunctive:
Rebutgem que la decisió es prengui sense consultar els veïns.
We reject the decision being made without consulting the residents.
By contrast, an explicitly attributed claim can retain the indicative because the grammar reports what the claim says, even while the surrounding sentence rejects it:
El comitè rebutja l'afirmació que el projecte és inviable.
The committee rejects the claim that the project is unviable.
Here que el projecte és inviable identifies the content of l'afirmació. The sentence acknowledges that this claim exists, then says the committee rejects it. The difference is subtle but useful: direct nega que sigui places the proposition under denial; rebutja l'afirmació que és can quote or identify an independently formulated claim.
Other ways to express uncertainty
Catalan divides uncertainty expressions by construction. És possible que, pot ser que, and és probable que take a subjunctive clause. The adverb potser, however, normally combines with the indicative.
Pot ser que demà plogui tot el dia.
It may rain all day tomorrow.
Potser demà plourà tot el dia.
Perhaps it will rain all day tomorrow.
Both communicate possibility, but their syntax differs. This is a point where Spanish transfer can be particularly misleading: standard Catalan does not need a subjunctive merely because potser expresses uncertainty.
Weak pronouns and agreement
Weak pronouns stand before a finite subjunctive, with no preceding the cluster. The verb agrees with its own subject, even when that subject is omitted.
Dubto que se n'adonin abans de la reunió.
I doubt they'll realize it before the meeting.
No crec que ens ho expliqui avui.
I don't think he will explain it to us today.
In se n'adonin, plural -in identifies the omitted subject as third-person plural; se n' belongs to pronominal adonar-se de. In ens ho expliqui, ens and ho are objects, not subjects: singular expliqui agrees with the person doing the explaining. Central forms are used throughout. Valencian standard has corresponding present-subjunctive forms such as adonen and explique (regional: Valencian); the clitic syntax and mood choice are the same.
Mini-dialogue: checking a rumor
—Diuen que tancaran la biblioteca. —No crec que la tanquin; acaben de renovar-la.
—They say they're going to close the library. —I don't think they'll close it; they've just renovated it.
—L'ajuntament nega que hi hagi cap decisió presa. —Doncs jo no dubto que aviat en sabrem més coses.
—The council denies that any decision has been made. —Well, I have no doubt we'll know more soon.
No crec and nega suspend or reject the reported proposition, hence tanquin and hi hagi. No dubto expresses confidence, so the future indicative sabrem presents the later discovery as expected.
Common Mistakes
1. Using the indicative after direct doubt.
❌ Dubto que tenen prou temps per acabar-ho.
Incorrect—the proposition is directly questioned.
✅ Dubto que tinguin prou temps per acabar-ho.
I doubt they have enough time to finish it.
2. Using the indicative after negated belief.
❌ No crec que aquesta clau obre la porta.
Incorrect—the speaker does not endorse the proposition.
✅ No crec que aquesta clau obri la porta.
I don't think this key opens the door.
3. Applying the subjunctive to every negative main clause.
❌ La Marta no sap que avui l'oficina tanqui a les cinc.
Incorrect here—the speaker asserts the closing time as information.
✅ La Marta no sap que avui l'oficina tanca a les cinc.
Marta doesn't know that the office closes at five today.
4. Copying a Spanish mood pattern after potser.
❌ Potser demà arribin més tard.
Avoid this in standard Catalan—potser normally introduces an indicative clause.
✅ Potser demà arribaran més tard.
Perhaps they will arrive later tomorrow.
Key Takeaways
- Dubtar que, negar que, and negated belief predicates normally take the subjunctive because the complement is not asserted.
- Affirmative belief and no dubtar normally take the indicative.
- A negative main clause does not automatically trigger subjunctive; ask whether the speaker rejects the dependent proposition itself.
- Pot ser que takes subjunctive, while adverbial potser normally takes indicative.
- Choose present versus perfect subjunctive according to event time, and keep weak pronouns before the finite verb.
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Start learning Catalan →Related Topics
- What the Subjunctive ContributesB1 — Understand the Catalan subjunctive as a mood of dependent, nonasserted situations—not simply uncertainty.
- Subjunctive after Emotion and EvaluationB1 — Use the present subjunctive when a Catalan clause is reacted to, judged, or presented through an emotional response.
- Subjunctive after Impersonal ExpressionsB1 — Use impersonal frames to express necessity, advice, possibility, and evaluation with an appropriately marked dependent clause.
- Subjunctive in Indefinite and Negative Relative ClausesB2 — Choose between indicative and subjunctive in Catalan relative clauses according to whether the antecedent is identified, asserted, sought, or denied.
- Indicative or Subjunctive: Assertion and StanceB2 — Choose Catalan indicative or subjunctive by tracking commitment, identification, factual concession, desired outcomes, and temporal viewpoint.
- Indicative or Subjunctive?B1 — Choose Catalan indicative or subjunctive by deciding whether a clause is asserted or placed inside desire, evaluation, nonidentification, or another nonassertive frame.