Commas (Mastering English Grammar Book 7)

Our six comma rules:
Introductory
Medial
Terminal
Items in a Series
Two Adjectives
Compound Sentences
To use any of these six comma rules, we first need to learn how to create sentences that call for one or more of the six comma rules listed above. For example, to apply rules 1-3, we need to understand what it means to add words, phrases, or clauses to base sentences. Because of this, much of what this book teaches about comma placement is really the teaching of sentence structure.
As we move beyond the foundational lessons of the book, our sentences grow more sophisticated as we learn how to construct sentences that require multiple comma rules within the same sentence.