The indefinite pronouns anyone, anything, everyone and everything are used in different contexts.
Everyone (meaning every person) and everything (meaning all things) refer to a totality.
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Everyone does it.
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Is everyone here?
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I don’t know everyone here.
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I am no different from everyone else.
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You have everything to gain.
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Do you have everything in place?
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Anyone (meaning any person) and anything (meaning something) do not generally refer to a totality.
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Is there anyone else you would like to see?
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Do you have anything in mind?
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Is there anything else you need?
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When preceded by a negative verb, however, anyone and anything refer to a totality in the negative sense.
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There isn't anything you can do right now.
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I don't know anyone here.
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