existieran
-they existed
The word existieran is the imperfect subjunctive form of existir in the third person plural.
See the full existir conjugation

existir

Yo no tenia idea que esas cosas existieran en Inglaterra.
I had no idea that such things existed in England.
Si no existieran, la tierra sería una bola de hielo.
If they weren't there, the earth would be a ball of ice.
Imagínate que existieran muchas pipas que vienen desde el cielo.
Imagine that there are many pipes coming down from heaven.
¿Qué ocurriría si estas dos cosas ya no existieran?
What would happen if these two commodities no longer existed?
¿Y si existieran más portales como este alrededor del mundo?
And if there are more portals like this in the world?
Como si los hombres no existieran para ti.
As if the men didn't exist for you.
Dice que nadie sabía que existieran hasta hace pocos años.
He says no one knew they existed until a few years ago.
Si existieran procedimientos mínimos, las cosas serían mucho más fáciles.
If there were minimum procedures, it would make things much easier.
Es posible, pero si existieran, nadie tiene permiso para verlas.
Perhaps, but when present, no one has permission to see them.
Pero si existieran, la prueba estaría en su libro de contabilidad.
But if they did, the evidence would be in his personal ledger.
No creía que existieran los autos cuando tú estabas en la universidad.
I didn't think cars existed when you were in college.
Dice que nadie sabía que existieran hasta hace unos pocos años.
He says no one knew they existed until a few years ago.
Nos comportábamos como si los demás no existieran.
Each one of us acting like the others didn't exist.
Es como si no existieran para el mundo oficial.
It is as if to the official world... they did not exist.
Estamos hablando de garantías mínimas del procedimiento como si no existieran.
We are talking about minimum guarantees of procedure as if there were none.
Para nuestro ambiente mediático es como si no existieran.
In our media environment, it's as if they don't even exist.
Si las Naciones Unidas no existieran tendríamos que inventarlas.
If the United Nations did not exist, we would have to invent it.
A partir de ahora, trataremos a los Croods como si no existieran.
From now on, we'll treat the Croods like they don't exist.
Si las nubes no existieran, entonces no disfrutaríamos del sol.
If clouds did not exist, then we would have no enjoyment of the sun.
No, quiero decir... Incluso si realmente existieran,
No, I mean, even if they did really exist,
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