Possible Results:
hubiera silbado
-I had whistled
Past perfect subjunctive yo conjugation of silbar.
hubiera silbado
-he/she/you had whistled
Past perfect subjunctive él/ella/usted conjugation of silbar.

silbar

Es como si hubiera silbado y llamaron a alguien para repararlo.
It's almost as if it started whistling then they called someone in to fix it.
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