CCSS.ELA-LITERACY.L.5.2.C Use a comma to set off the words yes and no (e.g., Yes, thank you), to set off a tag question from the rest of the sentence (e.g., It’s true, isn’t it?), and to indicate direct address (e.g., Is that you, Steve?).
The following videos are all short and comical. They make great hooks to lessons on commas.