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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.
Using Commas In Other Places. 1  1. Use a comma to separate an absolute phrase. 2  2. Use a comma to separate an adverb clause. 3  3. Use commas to separate things in a list or series.  4. Understand the âOxford Comma.â The Oxford comma (also known as the Harvard comma) is a comma placed before the final item in a list or series.