Commas Items In A Series. Despite the fact that not all style books agree on this issue, we recommend using a comma after the next-to-last item in a series—the serial comma, as it is called (or the Harvard or Oxford comma). To put it in a sentence The Oxford (or Serial) Comma: Using a Comma before "and" in a List.
Use commas to separate three or more words, phrases, or clauses in a series.
Students need to read each sentence and decided if the commas are used This resource includes everything you need to teach your students to use commas to separate items in a series.
Rewrite each set into a single sentence with a series. Note: in the answers we have not included the comma immediately before "and" or "or" (the so called Oxford comma or serial comma), though it is completely acceptable to do so. The serial comma can provide clarity in certain situations.