Here's why:
* Different Languages: Spanish and Portuguese are distinct languages, though they share a common ancestor. They have different grammar, pronunciation, and vocabulary.
* Geographic Distance: Spanish and Portuguese are spoken in different regions. While they share a border in Spain and Portugal, they are not commonly spoken in each other's countries.
* Limited Exposure: Many Spanish speakers do not have significant exposure to Portuguese. Even if they learn a few words, they are unlikely to be fluent.
However, there are some exceptions:
* Border Regions: People living in border regions between Spain and Portugal might be more likely to speak some Portuguese due to proximity and interaction.
* Multilingual Individuals: Some individuals, especially those who travel or have family connections in both countries, might be bilingual in Spanish and Portuguese.
Overall, it's not accurate to assume that all Spanish speakers know Portuguese. While there may be some exceptions, most Spanish speakers do not have the necessary skills to be fluent in Portuguese.