During this lesson, you will learn how to use commas in relationship to sentence parts. As you progress though this lesson, remember what you have learned about sentence and sentence faults in Lesson 3. Before you begin this Lesson, see how much you already know about commas and sentence parts. Insert commas where you think they should be in the Problem version of the sentence that appear on the next page. Check youself against the corrected version of the sentence in the Solution section that follows.