hubieran presenciado
-they/you had witnessed
Past perfect subjunctiveellos/ellas/ustedesconjugation ofpresenciar.

presenciar

Puede que algunos de ellos también hubieran presenciado su crucifixión.
Some of them may have been present during his crucifixion.
Pero pronto se dieron cuenta de que ésta era la peor que alguna vez hubieran presenciado.
But they soon realized this storm was worse than any other they had known.
Estoy seguro que nuestros pocos nacional-socialistas franceses no les hubieran seguido hasta el final si hubieran presenciado eso.
I am sure our few French National Socialists would not have followed it to the end, had they seen it at work.
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