The Subjunctive Used to Indicate Nonexistence
(El subjuntivo para indicar inexistencia)

The subjunctive is also used to talk about things and situations that are unknown or nonexistant. There are a few expressions that always take the subjunctive in this context:

no conocer a nadie que

no existe nada que
no existe nadie que
no existe ningun/a __ que
no hay nada que
no hay nadie que
no hay ningun/a __ que

Examples: No conozco a nadie que entienda las películas de David Lynch.
  No existe ningún libro que te enseñe a ser feliz .
  No había nada que me pudiera hacer cambiar de opinión.

There are also many verbs and expressions that are only used with the subjunctive when they indicate something unknown or nonexistant, and are otherwise used with the indicative. One of the clearest examples is the verb buscar:

1. Busco una casa que tenga cuatro habitaciones y que esté cerca de la universidad =
I'm looking for a house that has 4 bedrooms and is near the university
(but I don't have a specific house in mind and I don't know if such a house even exists)

2. Busco una casa que tiene cuatro habitaciones y que está cerca de la universidad =
I'm looking for a house that has 4 bedrooms and is near the university
(I have a specific house in mind and I know that it exists, I'm just not sure where it is)


The subjunctive is also used to talk about future things and situations that are taken to be unknown. The subjunctive is used after various words and phrases in this context:

antes de que*
cuando
en cuanto
después de que
hasta que
mientras
tan pronto como

In these cases, it's important to distinguish between using the subjunctive to indicate an unknown future and using the indicative to indicate a known present. The following examples should help you to understand this difference:

1. Cuando vamos al cine, siempre comemos palomitas de maíz.
When we go to the movies, we always eat popcorn (this is something that happens often, it's just stating a simple fact)

2. Cuando vayamos al cine este fin de semana, quiero comer palomitas de maíz.
When we go to the movies this weekend, I want to eat popcorn (going to the movies is a plan, it hasn't happened yet, and so it's part of the unknown future)

* The subjunctive is always used after antes de que, because this phrase always implies an unknown future.


Finally, the subjuntive can be used with "que", "lo que", "donde", "como" and "quien" to express English "whatever", "whenever", "however" and "whoever"; note that all of these expressions refer to things, people, or places that are unknown:

El metro de Madrid te llevará a donde quieras ir = The Madrid metro will take you wherever you want to go.

Quien esté libre de pecado, que tire la primera piedra = Whoever is without sin, let him throw the first stone.

Tenemos que arreglar el coche como podamos = We have to fix the car however we can.

Hacíamos lo que Julieta dijera = We used to do whatever Julieta said.

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