you don't, but there is an element of code-switching that goes on in English. given that French, Greek and Latin-origin words in English tend to have come down

you don't, but there is an element of code-switching that goes on in English. given that French, Greek and Latin-origin words in English tend to have come down from the clergy or the aristocracy, there is a subconscious subtext of power and education - and on the flipside pretense and elitism - that can be given off with particular use or lack of use of those words. some people do this naturally and some people affect it - Boris Johnson is well-known for it - but, while not quite the same as switching between Spanish and English - it is a thing that occurs