French · Pronunciation Guide
pro-SHAN — the "ch" is "sh", and "-ain" is a nasal vowel, not "ayn".
pro-CHAIN, weight on the second syllable, which is also the nasal one, so the word ends on an open hum. The feminine "prochaine" changes that ending completely: /pʁɔ.ʃɛn/, with a real "n" and no nasalization.
Listen: prochain
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Je descends au prochain arrêt.
I'm getting off at the next stop.
Listen: Je descends au prochain arrêt.
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"Je descends au prochain arrêt" puts "prochain" before the noun, and the pairing creates a liaison: "prochain arrêt" is /pʁɔ.ʃɛ.n‿a.ʁɛ/, with the nasal releasing into a real "n" before the vowel. "Descends" is /de.sɑ̃/ with silent "d" and "s", and "au" is the contraction of "à le".
The "-ain" ending gets read as English "ain" in "main" or "rain", giving "pro-SHAYN". It is a nasal vowel: an open "eh" through the nose with nothing touching. The "ch" also gets the English treatment. And the masculine/feminine pair is worth learning together, since "prochaine" turns that nasal into an ordinary vowel plus a real "n" — a bigger change than the spelling suggests.