O
The (masculine singular)
Language note: Definite article masculine singular: o. Feminine is “a”. Plurals: “os/as”.
Culture note: You’ll hear articles before names sometimes: “o Porto”, “a Lisboa” (less common), “o Chiado” (neighbourhood). It’s a very Portuguese habit.
Context: You add the masculine singular definite article used with that noun.
Word-by-Word Breakdown
O
[oo]
the (masculine singular)
Definite article used before masculine singular nouns (like “comboio”).
O comboio para Lisboa já chegou.
The train to Lisbon has already arrived.
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