How to Say "day before" in Spanish
The Spanish word for “day before” is “víspera” — B1 level. This is a very common word in everyday Spanish.
Examples
La víspera de Navidad es mi época favorita del año.
Christmas Eve is my favorite time of year.
Estudió mucho en la víspera del examen.
He studied a lot on the day before the exam.
El país se encontraba en la víspera de una revolución.
The country was on the brink of a revolution.
Always Feminine
Even though it doesn't end in '-a' in some plural contexts, 'víspera' is a feminine word. Always use 'la' or 'las' with it.
Connecting with 'de'
To specify which day you are talking about, always follow 'víspera' with the word 'de' (of), as in 'víspera de [Event]'.
Víspera vs. Ayer
Mistake: “Ayer de la fiesta fue divertido.”
Correction: La víspera de la fiesta fue divertida.
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