Question

1. It helps us talk to people at any place where they are.
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What does 'at any place where they are' modify? Does it modify 'people'? Or does it modify something else?

Answer 1

That's a very wordy and awkward sentence. It would be better written like this:

<i>It helps us talk to people wherever they are.</i>

In your sentence, though, the phrase and the clause after "people" modify that word, yes.