I know が and は have been done to death, (like this [What's the difference
between wa (は) and ga
(が)?](https://japanese.stackexchange.com/questions/22/whats-the-difference-
between-wa-%e3%81%af-and-ga-%e3%81%8c)) but i recently read a line a it got me
kind of confused.

It was 「なんで大人はいるの？」

So, I believe は emphasizes what comes after, and が emphasizes what comes
before. (is this true?)

So my guesses are は is like, why are THERE adults, (out of all places, why
here)

And が is something like, why are there ADULTS, (out of kids and adults, why
adults)

But they still both mean the same thing? So I'm kinda confused? What does the
sentence truly mean?

(Also, could this sentence mean, why are adults here, or would that have to be
なんで大人はここにいるの？) Even after reading so many explnations, は vs が for these type
of sentences still make no sense :) Like if I said, マクドナルドがあります vs
マクドナルドはあります, they both mean the same thing.

ありがとうございます
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2023-05-11T23:51:15.190
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2023-05-11T23:51:15.190
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question
grammar
Word choice of は vs が for this sentence