instruisteis
-you instructed
The word instruisteis is the preterite form of instruir in the second person plural.
See the full instruir conjugation

instruir

Las palabras son consecuencia de ellos y si el cambio es sincero, estas saldrán suaves, profundas, verdaderas y moverán montañas, como bien sabéis porque ya os instruisteis.
The words elapses from them and the sincere change is soft, deep, true and transport mountains, as we have already instructed you.
Want to Learn Spanish?
Spanish learning for everyone. For free.
SpanishDict Premium
Have you tried it yet? Here's what's included:
Cheat sheets
No ads
Learn offline on iOS
Fun phrasebooks
Learn Spanish faster
Support SpanishDict