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Seven Fundamental Comma Rules

Commas have an essential function in creative writing. They indicate to the reader which words should go together in a sentence and which parts of the sentence are the most important. But this little punctuation mark often causes big problems for writers. When do you use a comma? Where does the comma go in a sentence? When do you leave out the comma? What are the rules for comma use?

The comma “rule” that many of us learned—to place a comma anywhere we think a reader should pause—often results in muddled, nearly incoherent sentences like the following:

When Susan was a child, she wanted to be an astronaut, or a doctor, or a banker, but when she graduated from high school, she decided, that she would like to become an artist, and live in a big, exciting, fun city.

This “rule” is, of course, not a rule at all, and following it made the sentence above very difficult to read. Are all nine commas really necessary? Let’s check the seven fundamental comma rules.

Comma Rule 1: Use a comma before coordinating conjunctions that join independent clauses.

Coordinating conjunctions: and, but, for, nor, or, so, yet

Independent clause: a word group that contains at least one subject, at least one verb, and expresses a complete thought; also called a sentence.

Example: Tom enjoys writing poetry, and he has submitted several poems to regional literary magazines.

Comma Rule 2: Use commas to separate items in a series.

Example: She bought bread, milk, cookies, and juice.

Example: Of the three children, Becky is the oldest, James is the youngest, and Jack is the middle child.

Comma Rule 3: Use a comma after introductory words, phrases, and clauses.

Example: Quietly, she tiptoed past the sleeping child. (introductory word)

Example: Running quickly, Marjorie arrived at the bus stop before the bus pulled away. (introductory phrase)

Example: After he finished his homework, Brian read The Great Gatsby. (introductory clause)

Comma Rule 4: Use commas to set off nonrestrictive phrases or clauses from the rest of the sentence.

Nonrestrictive phrase or clause definition: a phrase or clause that adds nonessential information to the sentence. In other words, if the phrase or clause was removed from the sentence, the sentence would still retain its original meaning.

Example: Several politicians, lawyers, and business leaders attended the conference, which began at 2 p.m. (nonrestrictive clause)

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Comma Rule 5: Use a comma between adjectives that modify the same noun.

Hint: If you can put and or but between the adjectives, a comma will probably belong there.

Example: Edgar is a tall, distinguished businessman. (Since we could write tall and distinguished, the comma is necessary.)

Example: When I was in college, I lived in a small brown house next to a filling station. (Since we are not likely to say that we lived in a small and brown house, no comma is necessary between these adjectives.)

Comma Rule 6: Use a comma to separate a direct address from the rest of the sentence.

Example: Becky, please go to the store and buy some milk.

Example: If we don’t go soon, Barney, it will be too late.

Comma Rule 7: In direct quotes, use a comma (or commas) to separate the speaker from the quote.

Example: The teacher said, “Please pass your essays to the front of the room.”

Example: “I want to go to Grandma’s house,” the child said.

Example: “Drive to the mall,” Mother said, “and buy a new sleeping bag for your camping trip.”

Learn more about commas and dialogue format.

Comma placement is not difficult if we follow these basic rules. So let’s take another look at the first example: How many of the nine commas are necessary? If you said five, you’re correct. Here’s the sentence as it should be punctuated:

When Susan was a child, she wanted to be an astronaut or a doctor or a banker, but when she graduated from high school, she decided that she would like to become an artist and live in a big, exciting, fun city.

The first comma in the sentence follows rule 3: Use a comma after introductory words, phrases, and clauses.

The second comma follows rule 1: Use a comma before coordinating conjunctions that join independent clauses.

The third comma follows rule 3: Use a comma after introductory words, phrases, and clauses.

The fourth and fifth commas follow rule 5: Use a comma between adjectives that modify the same noun.

Check out our other articles on comma usage:

Serial Commas, Ellipses, and Em Dashes

The Common Comma

Writing News: Of Commas and Mice

Fragments and Run-On Sentences: Sentence Spoilers

Comma placement can be tricky, but if we follow the fundamental rules, it can—and will—become second nature. (Still unsure? Writer’s Relief offers proofreading for writers who want to submit their best work to editors and literary agents. Or sign up for our Submit Write Now!, which delivers monthly articles to your in-box on the mechanics of writing and the ins and outs of the publishing industry. Best of all, it’s free!)

5 Comments

  1. Elizabeth

    Thanks for this. I am always confused about commas.

    Reply
  2. Russell_bowring

    A ripper reference! Thank you. This is a much needed help for those of us who were looking out the window when punctuation was being taught at school. Russell

    Reply
  3. bob

    good job

    Reply
  4. J.S.

    Thank you, I love the examples, and have been making my own to try and memorize where commas go. Maybie by next week the cridics in my critter circle will stop yelling at me. XD

    Reply
  5. liberty

    Thank you so much for your work!

    Reply

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