"This is your daily, friendly reminder to use commas instead if periods during the dialogue of your story," she said with a smile.
"Unless you are following the dialogue with an action and not a dialogue tag." He took a deep breath and sat back down after making a clarifying statement.
"However," she added, shifting in her seat, "it's appropriate to use a comma if there's an action in the middle of a sentence."
"True." She glanced at the others. "You can also end with a period if you include an action between two separate statements."
"This is an excellent tutorial on how to write dialogues!" His joy was clear in his voice. "I'm always confused about when to include commas," he said, an open and honest look on his face, "but I'll do my best to remember this."