The Subjunctive with
Doubt, Disbelief or
Denial
Vistas 13.2
13.2 Subjunctive with verbs of doubt or
denial
Whenever a sentence express doubt or denial in the main
clause, the subjunctive will be used the subordinate clause
because it implies uncertainty.
However, if a sentence express certainty in the main clause,
the indicative will also be used in the subordinate clause

Doubt / Denial = Subjunctive
No es cierto que vengan muchas personas a la fiesta

Certainty = Indicative
Es cierto que vienen muchas personas a la fiesta.
Expressions of doubt

*Dudar

To doubt

*Negar (e-ie)

To deny

*No creer / pensar

To not believe / think

*No estar seguro/a de

To not be sure

*No es cierto

To not be certain

*No es verdad

To not be true

*No es obvio

It is obvious

Es (im)posible

To be (im)possible

Es (im)probable

To be (im)probable
Important notice
The following verbs in their opposite form represent certainty and
are followed by the indicative:
SUBJUNCTIVE
*Dudar
*Negar (e-ie)
*No creer
*No estar seguro/a de
*No es cierto
*No es verdad
INDICATIVE
No dudar
No negar (e-ie)
Creer
Estar seguro/a de
Es cierto que
Es verdad que
Wrap your mind around it
If you think or believe it is certain, so
 PENSAR and CREER in the affirmative form are followed by the
Indicative.
Pienso que es una buena idea ir al cine el Viernes.
Expressions involving possibility or probability are always uncertain, so
 (No) es (im)posible and (No) es (im)probable are followed by the
Subjunctive.
Es imposible que yo reciba un coche de Navidad.
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The Subjunctive with Doubt, Disbelief or Denial 13.2