Why does the definite article "o" sometimes come before the "que"?

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What is the difference between "a" and "á" in Portuguese?
Nayane Bremm
¿Cuál es la différencia entre "lastname" o "surname"?
Nayane Bremm
Quando eu uso "may" expressando duvida? Pode me explicar quando uso "may" e nao posso usar "can" ao inves?
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Introduction: XoKo Yu
XoKo Yu
How do you say "American", as in someone (or something) from the United States, in Spanish?
Nayane Bremm
¿Cuál es la diferencia entre usar fine y good? Es válido decir: i'm good, we're good, it's fine?
Nayane Bremm
Como se diferencia "sie" y "Sie" en la pronunciación?
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¿Cuál es la diferencia entre la pronunciación de woman-women y man-men?
Nayane Bremm
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