Spanish · Pronunciation Guide
BWEH-nohs DEE-ahs. The accent on "días" splits the i and a into two separate syllables.
Two words, two beats: BUE-nos and DÍ-as. "Buenos" ends in s, so the default rule stresses the second-to-last syllable — no accent needed. "Días" also ends in s, and by default would be pronounced "DYAS" as a single syllable; the written accent on the í breaks the i-a into a two-syllable hiatus, DÍ-as, which is the whole reason it is there.
Listen: buenos días
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Buenos días a todos.
Good morning, everyone.
Listen: Buenos días a todos.
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"Buenos días a todos" is plural in Spanish where English says a singular "good morning" — the greeting is literally "good days". That plural s ending on both words is what triggers the accent on "días" in the first place. Say "días a" without a pause and the final s links into the following vowel, giving DEE-ah-sah.
Most learners collapse "días" into one syllable, "DYAHS", because English reads "ia" as a glide. The accent exists precisely to stop that: it is DEE-ahs, two clear beats. The other giveaway is the b in "buenos", hammered out as a hard English B with the lips popping apart. In Spanish the lips come together loosely and the air keeps flowing, so the word starts softer than you expect.