Spanish · Pronunciation Guide
preh-oh-koo-PAH-thoh, five beats — the e and o are separate syllables.
Five syllables: pre-o-cu-PA-do, stressed on the second-to-last, following the default rule. The e-o hiatus at the start adds a syllable that English readers usually miss. The verb "preocuparse" keeps the same opening and moves the beat to PAR because of its r ending.
Listen: preocupado
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Estoy preocupado por el examen.
I'm worried about the exam.
Listen: Estoy preocupado por el examen.
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"Estoy preocupado por el examen" needs "por" after the adjective — worried about is expressed with por. "Examen" is stressed ek-SA-men, second-to-last, with no accent needed since it ends in n. Its plural "exámenes" does need one.
Squash the eo into one syllable and the word loses a beat, arriving as "pre-oh-cu-PA-do" or, worse, "pryo-cu-PA-do". Both vowels are strong and each takes its own beat. The English "preoccupied" also misleads in meaning — Spanish "preocupado" is worried, not distracted. And the preposition is "por", not "de" or "con".