Spanish · Pronunciation Guide
MOO-choh, two beats — the u is "oo" and the ch is as in English "church".
MU-cho: two syllables, and the first carries the beat, which is where the default rule puts it. All four forms keep it. The related adverb "muy" is a shortened cousin used before adjectives, and the split between them is worth learning: "muy" modifies adjectives and adverbs, "mucho" modifies nouns and verbs.
Listen: mucho
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Hoy trabajé mucho.
I worked a lot today.
Listen: Hoy trabajé mucho.
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"Hoy trabajé mucho" uses "mucho" after a verb, where it works as an adverb and stays in its unchanging masculine singular form. "Trabajé" carries an accent to hold the stress on the final é and mark the past tense, and its j is the throaty back-of-mouth sound.
English "much" supplies a flat, unrounded vowel that Spanish does not have, and the word comes out "MUH-cho". Spanish u is always a rounded "oo". The bigger error is choosing between "muy" and "mucho": "muy bien" is correct but "mucho bien" is not, and "mucho gusto" is correct but "muy gusto" is not. The rule is about what follows, not about intensity.