When to Use A Comma Before "Or" | Grammarly
WebSep 30, 2022 · Always place a comma before or when it begins an independent clause, but if it begins a dependent clause, don’t. In a series (or list) of three or more items, you can use a comma before or, but this is a preference, not a rule. People often get muddled about whether to place a comma before conjunctions like and, so, because, and or.
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