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Can someone please help me locate the punctuation rule for gerunds? I am almost certain a comma should be placed before the gerund "claiming" in the sentence below, but I cannot find any grammatical explanation anywhere. Am I confusing gerunds with participles here?

"For years Chevy and Ford fans have been battling each other claiming that one's loyal company was better than the other."

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claiming is not a gerund in this sentence: it is a participle, and it heads a participle phrase. The participle phrase modifies "Chevy and Ford fans", which it doesn't follow immediately, so a comma is required.

Furthermore, for years is an adverbial phrase: when you place an adverbial phrase at the start of a sentence, a comma is required.

For years, Chevy and Ford fans have been battling each other, claiming that one's loyal company was better than the other.

This excellent article describes the difference between gerunds and participles, and explains the punctuation rules in various situations.

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