- after an introductory phrase or statement, like a prepositional phrase.
- After her introduction, the magician took the stage.
- I packed socks, pajamas, and t-shirts.
- I packed socks and pajamas and t-shirts.
- You may wear slacks or shorts or jeans.
- The cold, hard bed was very uncomfortable.
- He was a dignified older man.
- It was a large brick house.
- He drove a sleek red car.
- His truck, a Ford F-150, was parked in the driveway.
- That was an awesome Super Bowl, wasn't it?
Never use commas ...
- to separate subjects from verbs, verbs from direct objects, or any other component of the ten basic sentence patterns from one another (as described in Grammar by Diagram by Cindy Vito).
Special comma rules
See my previous posts for specific comma rules involving: