Spanish · Pronunciation Guide
em-peh-SAR, three beats with the stress at the end — the z is a plain s sound.
Three syllables, em-pe-ZAR, beat at the end from the r ending. Two things happen at once when you conjugate it: it is a stem-changer, so the second e becomes ie under stress, giving em-PIE-zo; and the z has to become a c before an e, giving "empecé" in the past — a spelling change made purely to keep the s sound looking right.
Listen: empezar
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La clase empieza en diez minutos.
The class starts in ten minutes.
Listen: La clase empieza en diez minutos.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"La clase empieza en diez minutos" shows the stem-changed form with ie packed into one beat: em-PYEH-sa. "Diez" is a single syllable with a z pronounced as s, and "minutos" is stressed on NU. Spanish uses "en" for time-from-now, the same construction you met in "vuelvo en cinco minutos".
Buzz the z, English-style, and you produce a sound Latin American Spanish never uses, giving "em-peh-ZAR". Hiss it. The two opening e vowels then get reduced into a mumble, when both should be clear. And when conjugating, "empezo" instead of "empieza" is the standard slip — nothing in the infinitive warns you the stem will split.