The answer is:
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"no error".
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The comma is correctly placed before the conjunction "for"; and in this instance in which the word, "for", is used, a comma is necessary. No other part of the sentence needs—or requires—a comma, and there are no commas that are placed unnecessarily.
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As a side note, I would recommend that the first letter of the first word in the sentence: "Abbey", be capitalized, because:
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1) It is the first word at the beginning of the sentence; and:
2) It is someone's name, which is a proper noun.
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I also recommend placing a "period" at the end of the sentence.
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To read:
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<span>Abbey is most interested in learning how to mount her horse, for she already knows several things about dressage.
____________________________</span>
お誕生日おめでとうございます ... (name)
<span>Otanjoubi omedetou gozaiasu ... (name)</span>
Explanation:
It is the study of communication in every aspect of life. It is how you communicate:
At work
With adolescents
Interpersonally (most important and valuable)
Non-verbal
Understand political (and other types of public speeches or books) speeches and why certain words and phrases are chosen to influence the public
So much more….
Basically, it covers every aspect of how we, as individuals, communicate in every aspect of our lives in every way, every day.It's not all about speeches or speaking in public.