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.
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Answer:
hmm hello dear good evening
Sigular
Nom - Nomus, Noma, Namum
Gen - Genus, Gena, Genum
Dat - Datus, Data, Datum
Acc - Accus, Acca, Accum
Abl - Ablus, Abla, Ablum
Plural
Nom - Nomuses, Nomas, Namumes
Gen - Genuses, Genas, Genumes
Dat - Datuses, Datas, Datumes
Acc - Accuses, Accas, Accumes
Abl - Abluses, Ablas, Ablumes<span />
Answer:
You say there is one twin. Twins, when referred to as a set, require an s, just like most other groups of objects. There are the twins.