Portuguese (Brazil) · Pronunciation Guide
LAH, one syllable, wide open. The accent is there to distinguish it from another word, not to move any stress.
A monosyllable would normally go unmarked, so the accent here is doing distinguishing work: it separates the adverb "lá" from the unstressed pronoun "la." Portuguese uses accents on one-syllable words fairly often for exactly this reason, as in "é" versus "e" and "nós" versus "nos."
Listen: lá
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Ele já está lá.
He is already there.
Listen: Ele já está lá.
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"Ele já está lá" stacks two accented monosyllables, "já" and "lá," both with wide-open a's, and in speech "está" reduces to "tá" — giving three open a's in a row across four words. It's a surprisingly rhythmic little sentence once the reduction kicks in.
English speakers under-open the vowel and produce something closer to "luh," which barely registers as a word. Drop the jaw. The bigger issue is choosing between "lá" and "ali": "lá" implies real distance or somewhere out of sight, so pointing at a nearby chair and saying "lá" sounds odd to Brazilian ears.