mudarais
-you changed
The word mudarais is the imperfect subjunctive form of mudar in the second person plural.
See the full mudar conjugation

mudar

¿Qué hizo que todos os mudarais a Nueva York?
What made you all move out to New York?
¿Te pidió que os mudarais juntos?
He asked you to move in together?
¿Te pidió que os mudarais juntos?
He asked you to move in together?
Este reloj se perdió mucho antes de que tú y tu padre os mudárais aquí.
This watch went missing long before you and your father moved here.
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