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Is the phrase
to what extent there exist
a correct phrase? For example:
To what extent there exist disadvantaged families in this area?
I searched on it in google but did not find it used. So I am not sure if it is correct or not? Is there a better way to ask about the existence of a phenomenon in scientific research context?
You need a form of the verb "to do" in there somewhere:
To what extent does there exist disadvantaged families in this area?
That's a bit unusual though. It would be more idiomatic if you said:
To what extent do disadvantaged families exist in this area?
