hubierais cansado
Past perfect subjunctive vosotros conjugation of cansar.

cansar

Hemos recibido siempre de buen grado vuestra revista, es más, alguna vez, al ver que tardaba en llegar, hemos temido que os hubierais cansado de nuestro silencio.
We have always gladly received your magazine, indeed sometimes when it arrived late, we feared that you were tired of our silence.
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to pour