the way to use "to" or "for" correctly. for example: Your speech would be very confusing for your listener. why Here use "for" rather than "to". I really want to know how to use "to" and "for" correctly. and also I wonder what feeling makes the native speakers do the choice between "to" and "for", when they want to explain things,

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I mean "to" or "for" sb, what makes a native speaker do the choice.

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another sentence: The sound would be very choppy,mechanical and unemotional to an American. why there's a "to" rather than a "for".

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thanks a lot for help, I'm now waiting for your opinion. thanks again.