Spanish · Pronunciation Guide
el ow-toh-BOOS, three beats — the accent holds the stress on the final syllable.
Three syllables, au-to-BÚS, and the accent is doing real work. The word ends in s, so the default rule would give au-TO-bus. The mark pushes the beat to the end. The plural "autobuses" drops the accent entirely, because the added syllable puts the default stress on BU where it belongs.
Listen: el autobús
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El autobús pasa cada hora.
The bus comes every hour.
Listen: El autobús pasa cada hora.
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"El autobús pasa cada hora" uses "cada", which never changes form, and "hora" with its silent h — so "cada hora" runs as KA-da-O-ra. "Pasa" is stressed PA-sa with two wide-open a vowels and a hissed s between them.
The English "autobus" and "bus" both pull the stress forward, giving "AU-to-bus", which the accent explicitly forbids. The au then gets split into two syllables and the b gets popped when it should be soft. Regionally, plenty of speakers shorten this to "bus", "camión" in Mexico, or "colectivo" in Argentina — but "autobús" is understood everywhere.