Q: Can one mix languages in the Eucharistic Prayer, e.g. Spanish and English?
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A: Go here https://www.usccb.org/prayer-and-worship/the-mass/frequently-asked-questions/guidelines-for-a-multilingual-celebration-of-mass, and scroll to B 3 b. The priest’s parts are to remain in one language. The language for the acclamations is up for grabs.