Portuguese (Brazil) · Pronunciation Guide
ah-BEH-too, with a wide-open stressed vowel and a breathy r you can barely hear.
Second-to-last syllable stress, standard for an -o ending, no accent. This is the irregular past participle of "abrir" doing double duty as an adjective, and the open stressed e is a genuine sound feature you have to carry with the word — the spelling gives you no clue that it isn't the closed variety.
Listen: aberto
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O mercado está aberto.
The market is open.
Listen: O mercado está aberto.
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"O mercado está aberto" links "está aberto" so the final "ah" of the verb runs straight into the initial "ah" of the adjective, and in speech the two often fuse into a single longer vowel — especially since "está" is usually clipped to "tá."
The closed-vowel version, "ah-BAY-too," shifts the word away from what Brazilians say. Keep the jaw open. The r is the second casualty, since English speakers reflexively curl it. And the adjective agrees: a shop is "aberta," which learners fixated on the masculine participle often forget.