Standard Alignments:

CCSS ELA: L.5.2

L.5.2 Demonstrate command of the conventions of standard English capitalization, punctuation, and spelling when writing.

L.5.2.B

L.5.2.B Use a comma to separate an introductory element from the rest of the sentence.

L.5.2.C

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?).