Spanish · Pronunciation Guide
deh-BEHR, with a soft dental d at the front and an even softer b in the middle.
Two syllables, de-BER, weight on the last, following the r-ending default. Unlike "poder" and "querer", this verb is perfectly regular, so the stress moves in a predictable way through the conjugation: "DE-bo", "DE-bes", "de-BE-mos" — always on the second-to-last syllable of whatever the form happens to be.
Listen: deber
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Debo estudiar esta tarde.
I have to study this afternoon.
Listen: Debo estudiar esta tarde.
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"Debo estudiar esta tarde" pairs the conjugated "debo" with an infinitive to express obligation, and no preposition comes between them. "Estudiar" packs the ia into a single final syllable — es-tu-DYAR, three beats, stressed at the end because it finishes in r. Say "debo estudiar" and the o runs straight into the e.
Both consonants get hardened by English reflex, giving a clipped "DEH-bur" with a popping b and a curled r. The d should be dental and light, the b between vowels should barely close, and the r is one flick. Meaning-wise, note that "deber" carries both must and to owe — "debo cien pesos" is a debt, "debo estudiar" is an obligation, and only the structure after it tells you which.