English taught effectively and useful

I’m a Swedish physics student living in Barcelona. I have during my childhood gone to schools that demand very strong language skills. In the English language, I’ve exercised writing, speaking, and listening skills at that level since a very young age.
I have had various instructional jobs but not in teaching language specifically. These previous jobs still consisted of a lot of communication through multiple languages.
I believe that English should be taught as Ian the instrument, learn the foundational factory and mechanisms to then start evolving in your own way., and never stop listening

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