Today I'm beginning a two-part lesson, covering proper use of the comma — one of the most common punctuation errors I see when I critique...and read published works. *gasp* :) We should all know how to use commas when writing dates and such (ex: Monday, Jume 4, 2012 ), so I won't belabor that rule or others like it. This post will focus on commas commonly used in dialogue and narrative. In fact, let's get dialogue commas out of the way first. If you've been writing fiction long at all, you should know the difference between a dialogue tag and an action beat (sometimes called a descriptive line or beat). A dialogue tag tells us that words were said, sometimes telling us how they were said, and must use a word that denotes a way of speaking. (Ex: said, shouted, whispered, yelled, muttered , etc.) An improper tag would be something like 'smiled' because one cannot smile words. Action beats describe action. Dialogue tags are punctuated with commas, and action beats ...