Understanding the subjunctive after expressions of doubt is essential for speaking naturally and accurately. In Spanish, the subjunctive mood is often used when the speaker does not present information as certain, real, or confirmed. This happens frequently after expressions of doubt, uncertainty, disbelief, or denial.
In English, we usually do not change the verb form very much in these situations. However, in Spanish, the verb in the second part of the sentence often changes to the subjunctive. This is why learners need to pay close attention to the idea behind the sentence, not only to the words themselves.
Subjunctive After Expressions of Doubt in Spanish
Expressions of doubt are phrases that show that the speaker is not sure about something. They can also show that the speaker questions whether something is true.
Common expressions of doubt in Spanish include:
dudar de que – to doubt thatno creer que – not to believe thatno pensar que – not to think thatno estar seguro de que orno estar segura de que – not to be sure thatno parecer que – not to seem thates dudoso que – it is doubtful thates posible que – it is possible thates improbable que – it is unlikely thatpuede que – maybe, it may be that
These expressions with
Basic Structure
The basic structure for using the subjunctive after expressions of doubt in Spanish is: expression of doubt +
For example, in the following sentence,
Dudo que ellos lleguen a tiempo para la reunión porque todavía están muy lejos de la oficina.
I doubt that they will arrive on time for the meeting because they are still very far from the office.
Now let’s see more examples with common expressions of doubt. All these sentences use the subjunctive after expressions of doubt in Spanish because the speaker is not presenting the information as certain.
No creo que Marta tenga suficiente dinero para comprar ese coche nuevo este mes.
I do not think Marta has enough money to buy that new car this month.
No pensamos que el restaurante abra tan tarde durante la semana en esta pequeña ciudad.
We do not think the restaurant opens so late during the week in this small city.
No estoy seguro de que mis primos puedan venir a la fiesta el próximo sábado por la noche.
I am not sure that my cousins can come to the party next Saturday night.
Es dudoso que la empresa acepte nuestra propuesta sin pedir algunos cambios importantes primero.
It is doubtful that the company will accept our proposal without asking for some important changes first.
Puede que Ana estudie en la biblioteca esta tarde porque tiene un examen difícil mañana.
Ana may study in the library this afternoon because she has a difficult exam tomorrow.
Doubt vs. Certainty
A very important point is that Spanish often uses the indicative when the sentence expresses certainty, but the subjunctive when it expresses doubt.
In the first sentence,
Creo que Luis sabe la respuesta porque estudió mucho antes del examen de historia.
I think Luis knows the answer because he studied a lot before the history exam.
No creo que Luis sepa la respuesta porque no prestó atención durante la clase.
I do not think Luis knows the answer because he did not pay attention during the class.
Here is another pair:
Pienso que Clara tiene razón porque explicó muy bien todos los detalles del problema.
I think Clara is right because she explained all the details of the problem very well.
No pienso que Clara tenga razón porque olvidó una parte importante de la explicación.
I do not think Clara is right because she forgot an important part of the explanation.
This contrast is one of the most important parts of learning the subjunctive after expressions of doubt in Spanish.
Does “Maybe” Always Use the Subjunctive?
Words and expressions like
Use the subjunctive when the idea feels less certain:
Quizá ellos vengan a cenar con nosotros si terminan su trabajo antes de las ocho.
Maybe they will come to have dinner with us if they finish their work before eight.
Use the indicative when the speaker feels the idea is more likely or probable:
Quizá ellos vienen a cenar con nosotros porque me enviaron un mensaje hace diez minutos.
Maybe they are coming to have dinner with us because they sent me a message ten minutes ago.
For learners, this can be tricky because both forms are possible. However, when the meaning is clearly uncertain, the subjunctive is very common.
Expressions of Denial
Expressions of denial also usually trigger the subjunctive because they reject or question the truth of an idea.
Niego que mi hermano haya roto la ventana porque estaba conmigo en la cocina todo el tiempo.
I deny that my brother broke the window because he was with me in the kitchen the whole time.
El director niega que los estudiantes hayan recibido información incorrecta sobre el nuevo horario escolar.
The principal denies that the students received incorrect information about the new school schedule.
In these cases, the speaker is not confirming the action. Instead, the speaker denies it, so Spanish uses the subjunctive.
Subjunctive Tenses
Please note that the subjunctive after expressions of doubt can appear in different tenses. Two common forms are the present subjunctive and the present perfect subjunctive.
Use the present subjunctive when the action is present or future:
Dudo que Laura trabaje mañana porque todavía se siente muy cansada después del viaje.
I doubt that Laura will work tomorrow because she still feels very tired after the trip.
Use the present perfect subjunctive when the action may have already happened:
No creo que Laura haya terminado el informe porque todavía faltan varias secciones importantes.
I do not think Laura has finished the report because several important sections are still missing.
The expression of doubt remains the same, but the time of the action changes the subjunctive tense.
Exercises
The subjunctive after expressions of doubt in Spanish is used when the speaker does not present an idea as certain or confirmed. Please note that positive expressions of certainty (
Mastering the subjunctive after expressions of doubt in Spanish will help you express uncertainty, opinions, and possibilities more naturally. Let’s do some exercises to practice this grammar.