The indicative presents information as real, certain, or proven: Llega mañana, está en casa, sé la respuesta. The subjunctive presents the idea as not confirmed, desired, doubtful, or valued: Espero que llegue mañana, Quizá esté en casa, Me alegra que sepas la respuesta. In Spanish, the difference does not depend only on the tense, but on the speaker's attitude toward what is being said. If the speaker asserts a fact, they use the indicative. If they do not present the information as a closed fact, they use the subjunctive. That opposition appears in all of the grammar of Verb Moods and is the basis of Subjunctive Mood.

Basic contrast of certainty and doubt

Idea
Use indicative when you present information as certain or real.
Use subjunctive when you present a possibility, a doubt or something unconfirmed.
Use indicative for facts that the speaker considers verified.
Use subjunctive for wishes, emotions or subjective evaluations.

After verbs of requesting, ordering, advising, permission, or influence, the second action is normally in the subjunctive: Quiero que vengas, Te pido que me ayudes, Mi madre recomienda que comamos temprano. The structure is verb of influence + que + subjunctive. The first verb expresses intention or pressure; the second expresses the expected action of another person. Verbs such as mandar, dejar, permitir, sugerir and aconsejar also fit here. That is why we say El profesor exige que entreguemos el trabajo hoy and not entregamos, because the submission is still not presented as a completed fact. This usage is very common in Subjunctive Mood and also naturally appears in indirect orders related to Imperative Mood.

Subordinate clauses after requests and influence

Usage	Explanation
Direct request	After a verb of request, the subordinate clause usually goes in the subjunctive.
Kind advice	With verbs of advice, the subjunctive is used for the recommended action.
Command or demand	With verbs that express obligation or command, the subordinate verb goes in the subjunctive.
Emotional influence	When someone tries to get another person to act, the subjunctive marks that influence.

With ver, oír, saber and creer, the indicative appears when the sentence presents an observed, known, or assumed as true fact: Veo que está cansado, Oí que llegó el tren, Sé que trabaja aquí, Creo que tiene razón. Here the speaker treats the information as real for them. The subjunctive appears if it is denied, doubted, or questioned: No creo que tenga razón, No veo que haya problema, Dudo que sepan la dirección. The difference is not only in the main verb but in the attitude with which the subordinate information is presented. With affirmation and certainty, indicative; with negation, doubt, or lack of certainty, subjunctive.

Use with see know and believe

Usage	Explanation
Observed perception	With verbs of perception, the indicative presents what was seen or heard as a fact.
Certain knowledge	With know, the indicative affirms a piece of information as true.
Stated opinion	With believe, the indicative expresses the speaker’s belief as an assumed reality.
Auditory perception	With hear, the indicative is used when something perceived directly is described.

When the relative clause does not identify a concrete person or thing, the subjunctive is used: Busco un libro que explique esto, Necesito a alguien que hable francés, Quiero una casa que tenga jardín. The antecedent exists only as a sought idea, not as an object already known. The relative clause does not describe something specific in the real world, but something that is not yet defined. That is why in Quiero un coche que sea barato the speaker does not point to a concrete car; they ask for one with that characteristic. In this type of relative clause, the subjunctive appears closely linked to the notion of search, desire, or lack of identification.

Relative clauses with an unidentified antecedent

Usage	Explanation
Indefinite search	Use the subjunctive when you are looking for a nonspecific person or thing.
Lack of identification	If the antecedent is not identified, the relative clause usually goes in the subjunctive.
Hypothetical selection	When you choose among possible options, the subjunctive indicates that there is still no final choice.
Desire for existence	If the referent does not yet exist for the speaker, the subjunctive is used in the relative clause.

If the antecedent is already known, specific, or identified, the relative clause goes in the indicative: El libro que explica esto está en la mesa, La chica que habla francés vive aquí, La casa que tiene jardín es de Ana. Here we talk about a concrete referent, not one possible. The speaker assumes that that being or thing exists and can be pointed to. Indicative is also used when the relative clause only adds information about an element already recognized: Compré el coche que me recomendaste. The difference with the subjunctive relative clause lies in identification: if something is being sought, subjunctive; if something is described as located, indicative.

Relative clauses with an identified antecedent

Usage	Explanation
Known person	Use the indicative when the antecedent has already been identified and the relative clause describes it as known.
Specific object	When you are talking about a specific object, the indicative presents the information as real.
Verified fact	If the relative clause adds confirmed information, the indicative is used.
Identified referent	When the speaker already knows which element they are talking about, the relative clause goes in the indicative.

In sentences with cuando, hasta que, en cuanto, mientras, tan pronto como and other temporals, the mood depends on whether the action is presented as habitual, past, or future. With reference to the future or unrealized, the subjunctive usually appears: Cuando llegues, llámame, Hasta que no termines, no salimos, En cuanto tenga tiempo, te escribo. If the action is already habitual or past, the indicative is used: Cuando llego a casa, me ducho, Cuando llegaste, te llamé. With aunque there is a similar opposition. If it expresses a real or accepted fact, the indicative goes: Aunque está cansado, sigue trabajando. If it expresses a hypothetical concession, the subjunctive goes: Aunque esté cansado, saldrá a correr. The choice depends on whether the situation is presented as known or as possible.

Mood with when until although

Usage	Explanation
Future not yet completed	With future temporal expressions, the subjunctive appears when the event has not yet happened.
Expected limit	With until, the subjunctive is used if the end of the action is expected or future.
Real concession	With although, the indicative is used if the event is presented as real.
Hypothetical concession	With although, the subjunctive is used if the concession is hypothetical or unconfirmed.

There are expressions that tend to require always the same mood and it is useful to recognize them as blocks. With the indicative appear formulas like es verdad que, es cierto que, está claro que, resulta que, parece que when something is presented as a constatation: Es verdad que vive aquí, Parece que llueve. With the subjunctive they are very common es posible que, es probable que, es importante que, ojalá, quizá and tal vez when they express doubt or desire: Es posible que venga, Ojalá tengas suerte, Quizá llegue tarde. In many expressive phrases, the subjunctive is the habitual form because the speaker not only informs, but judges, desires, or fears. These turns are part of everyday usage learned together with Subjunctive Mood.

Antes de queTal vezEs importante queEs posible queQuizáA menos queMe alegra queOjalá

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Expresión que se usa para posibilidad y suele ir con indicativo o subjuntivo según la seguridadExpresión condicional que introduce excepción o condición y normalmente usa subjuntivoLocución que normalmente exige subjuntivo porque expresa posibilidadPalabra que puede introducir duda o posibilidad y admite varios modos según el contextoExpresión que muestra emoción positiva y requiere subjuntivoExpresión que marca deseo intenso y suele ir con subjuntivoLocución que introduce valoración o necesidad y pide subjuntivoLocución temporal que presenta una acción previa pendiente y suele ir con subjuntivo

Frequent expressions with the usual mood

Word	Definition
Ojalá	An expression that marks an intense wish and usually takes the subjunctive.
Quizá	A word that can introduce doubt or possibility and allows several moods depending on the context.
Tal vez	An expression that is used for possibility and usually takes the indicative or subjunctive depending on the level of certainty.
Es posible que	A phrase that normally requires the subjunctive because it expresses possibility.
Es importante que	A phrase that introduces evaluation or necessity and calls for the subjunctive.
Me alegra que	An expression that shows positive emotion and requires the subjunctive.
Antes de que	A temporal phrase that presents a pending prior action and usually takes the subjunctive.
A menos que	A conditional expression that introduces an exception or condition and normally uses the subjunctive.

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Sometimes both moods are possible, but the meaning changes. Busco un profesor que habla alemán presents a concrete professor who is already identified; Busco un profesor que hable alemán asks for anyone who meets that condition. Creo que viene sounds like conviction; No creo que venga expresses doubt. Aunque llueve, salimos recognizes the rain as real; Aunque llueva, salimos presents it as possible. In these cases, the mood not only marks grammatical correctness, but perspective. The indicative brings the information closer to the speaker's reality; the subjunctive distances it, conditions it, or makes it more subjective. That choice also affects tone in structures useful for Imperative Mood and for hypothetical forms related to Simple Conditional.

chanceigual

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Voz coloquial que expresa posibilidad o probabilidad en el habla informalPalabra coloquial que puede expresar posibilidad con mucha naturalidad en registros informales

Colloquial variants for possibility

Region	Variant	Definition	Example
Spain	igual	A colloquial word that can express possibility very naturally in informal registers.	Igual viene luego con una tortilla cósmica.Might come later with a cosmic omelet.
Mexico	chance	A colloquial word that expresses possibility or probability in informal speech.	Chance llega tarde porque perdió el taxi de las nubes.Chance he’ll arrive late because he lost the cloud taxi.

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