Punctuation is important to clarity in writing. Commas are a common punctuation mark that can spice up any writing. Commas are often used before a conjunction in a compound sentence. Commas are also used between items in a series of three or more items.
There are other comma uses including noun of direct address, interjection, and introductory word. Standards for this lesson focus on applying the conventions of standard English and correctly using punctuation to set off nonrestrictive or nonessential information.
The above grammar exercise for grades 3–5 focuses on Common Core State Standards L.5.2.B, L.5.2.C that states:
Demonstrate command of the conventions of standard English capitalization, punctuation, and spelling when writing.
b. Use a comma to separate an introductory element from the rest of the sentence.
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?)
Download my Common Core Grammar Activity: More Commas now!
Grammar worksheets focus on key CCSS Language Standards L.5.2.B, L.5.2.C