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Use a comma to separate contrasting parts of a sentence. Example: That is my money, not yours. Rule 16a. Use a comma before and after certain introductory words or terms, such as namely, that is, i.e., e.g., and for instance, when they are followed by a series of items.ule 1. Use commas to separate words and word groups in a simple series of three or more items. Example: My estate goes to my husband, son, daughter-in-law, and nephew.
Put a Comma before a Conjunction If It Joins Two Independent Clauses. Words like and, or, and but are known as conjunctions. This page is about conjunctions that are used to merge two standalone sentences (or independent clauses as they're really called) into one using a conjunction. This is a very common practice.