> If an English-speaking adult was placed in a monolingual Spanish family, in a part of Spain with no English speakers, after a few years they might find they’d learned Spanish “easily” too.
That is not so. That person would have an accent, struggle to say as well as understand things and make weird grammar mistakes that a four-year-old native speaker wouldn't.
Oh, and how about being immersed in a household speaking a language that is not even remotely related to English?
A child which speaks nothing and is learning Spanish natively is not comparable to someone who already knows English, which is in the same Indo-European family and has tons of congnate words with Spanish.
That is not so. That person would have an accent, struggle to say as well as understand things and make weird grammar mistakes that a four-year-old native speaker wouldn't.
Oh, and how about being immersed in a household speaking a language that is not even remotely related to English?
A child which speaks nothing and is learning Spanish natively is not comparable to someone who already knows English, which is in the same Indo-European family and has tons of congnate words with Spanish.