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We all need help with commas so we won't kill someone or ourselves. The proper use of commas is no joke.

A Panda walks into a cafe, orders a sandwich, eats it, then draws a gun, shoots it, and kills two people. Then shows the waiter a wildlife magazine that read: "Panda native to China. Eats, shoots, and leaves." I'm a panda and walked out the door.

The terrible misuse of commas can be tragic. The panda eats shoots and leaves...nice panda.

I've curated an article by Grammarly that will help navigate the sea of Comma Grammar Mistakes.

Comma—Grammar Rules

GRAMMARLY • Handbook Punctuation • Updated on 01 February 2017

Ah, the comma. Of all the punctuation marks in English, this one is perhaps the most abused and misused. And it’s no wonder. There are lots of rules about comma usage, and often the factors that determine whether you should use one are quite subtle. But fear not! Below, you’ll find guidance for the trickiest comma questions.

What Is a Comma?

While a period ends a sentence, a comma indicates a smaller break. Some writers think of a comma as a soft pause—a punctuation mark that separates words, clauses, or ideas within a sentence.

Comma with Subjects and Verbs

With few exceptions, a comma should not separate a subject from its verb.

My friend Cleo, is a wonderful singer.

Writers are often tempted to insert a comma between a subject and verb this way because speakers sometimes pause at that point in a sentence. But in writing, the comma only makes the sentence seem stilted.

My friend Cleo is a wonderful singer.

Be especially careful with long or complex subjects:

The things that cause me joy, may also cause me pain.
The things that cause me joy may also cause me pain.
Navigating through snow, sleet, wind, and darkness, is a miserable way to travel.
Navigating through snow, sleet, wind, and darkness is a miserable way to travel.
Comma examples - Culture Club Chameleon Pun

Comma Between Two Nouns in a Compound Subject or Object

Don’t separate two nouns that appear together as a compound subject or compound object.

Cleo, and her band will be playing at Dockside Diner next Friday.
Cleo and her band will be playing at Dockside Diner next Friday.
Cleo will wear a sparkly red blazer, and high heels.
Cleo will wear a sparkly red blazer and high heels.
When a subject or object is made up of two items and the second item is parenthetical, you can set off the second item with commas—one before it and one after it. But you don’t need a comma when you’re simply listing two items.

Comma Between Two Verbs in a Compound Predicate

You get a compound predicate when the subject of a sentence is doing more than one thing. In a compound predicate that contains two verbs, don’t separate them with a comma.

Cleo will sing, and play the banjo.
Cleo will sing and play the banjo.
This mistake is most common when the predicate is made up of long verb phrases.

I meant to buy tickets for Cleo’s show, but ran out of time.
I meant to buy tickets for Cleo’s show but ran out of time.
Don’t use a comma in compound predicates unless there is a chance of misreading:

Cleo spotted the man who entered the diner, and waved.
In the sentence above, you need the comma to make clear that it was Cleo who waved, not the man.

Comma Splices

When you want to join two independent clauses, you need a conjunction or a semicolon. A comma alone isn’t strong enough to join them. This kind of mistake is called a comma splice.

We were out of milk, I went to the store.
You can fix a comma splice by adding a conjunction or changing the comma to a semicolon.

We were out of milk, so I went to the store.
We were out of milk; I went to the store.
Or, you can simply write the two independent clauses as separate sentences.

We were out of milk. I went to the store.

Comma After Introductory Phrase

A comma normally follows participial phrases that introduce a sentence:

Grabbing her umbrella, Kate raced out of the house. Confused by her sister’s sudden change in mood, Jill stayed quiet.
When an adverbial phrase begins a sentence, it’s often followed by a comma but it doesn’t have to be, especially if it’s short. As a rule of thumb, if the phrase is longer than about four words, use the comma. You can also use a comma with a shorter phrase when you want to emphasize it or add a pause for literary effect.

After the show, Cleo will be signing autographs. Behind the building there is enough space to park two limousines. Without knowing why, I crossed the room and looked out the window. In 1816 life was very different. Suddenly, an angry black cat sprang from the shadows.

But, if there is a chance of misreading the sentence, use the comma:

Before eating the family said grace.
Before eating, the family said grace.
Comma Within a Comparison
Don’t use a comma before “than” when you’re making a comparison.

This box is lighter, than that box.
This box is lighter than that box.
Hardcover books are more expensive, than paperback books.
Hardcover books are more expensive than paperback books.
Commas with Interrupters or Parenthetical Elements
Interrupters are little thoughts that pop up in the middle of a sentence to show emotion, tone, or emphasis. A parenthetical element is a phrase that adds extra information to the sentence but could be removed without changing the meaning of the sentence. Both interrupters and parenthetical elements should be set off with commas.

The weather I was happy to see was beginning to clear.
The weather, I was happy to see, was beginning to clear.
Geoff’s cooking skills if you can call them skills left something to be desired.
Geoff’s cooking skills, if you can call them skills, left something to be desired.
It was sadly the last day of camp.
It was, sadly, the last day of camp.
Mary unlike Anne is very organized.
Mary, unlike Anne, is very organized.

Comma with a Question Tag

A question tag is a short phrase or even a single word that is added to the end of a statement to turn it into a question. Writers often use question tags to encourage readers to agree with them. A question tag should be preceded by a comma.

These willow trees are beautiful, aren’t they? You didn’t actually write a 600-page vampire romance novel, did you? I know, right?

Comma with Direct Address

When addressing another person by name, set off the name with commas.

Mom, I can’t find my shoes! Cleo, there’s someone on the phone for you. Hello, Chester.
Comma with an Appositive
An appositive is a word or phrase that refers to the same thing as another noun in the same sentence. Often, the appositive provides additional information about the noun or helps to distinguish it in some way. If you could remove the appositive without changing the meaning of the sentence, it is said to be nonessential and should be set off with commas. If the appositive is necessary, it’s said to be essential and it should not be set off with commas.

Nonessential appositives:

My mother, Angela, is a wonderful cook. The painter, one of the city’s most promising young artists, began showing his work in galleries before he was sixteen. Chocolate, my favorite treat, always makes me feel better after a bad day.

Essential appositives:

Edgar Allan Poe’s poem The Raven is a classic. Alec Baldwin’s brother Stephen is the most underrated Baldwin. The detective Sherlock Holmes is one of literature’s greatest sleuths.

Commas in Dates

When writing a date in month-day-year format, set off the year with commas.

July 4, 1776, was an important day in American history. I was born on Sunday, May 12, 1968.
If you are using the day-month-year format, however, commas are unnecessary.

Applications are due by 31 December 2016.
If you are referencing a day of the week and a date, use a comma:

On Tuesday, April 13, at three o’clock, there will be a meeting for all staff. Please join us on Saturday, June 14, 2010, for the marriage of Annie and Michael.

When you are referencing only a month and year, you don’t need a comma.

The region experienced record rainfall in March 1999.

Comma Between Coordinate Adjectives

When multiple adjectives modify a noun to an equal degree, they are said to be coordinate and should be separated by commas. One way to tell whether the adjectives are coordinate is to try switching the order of them. If the sentence still sounds natural, the adjectives are coordinate.

That man is a pompous, self-righteous, annoying idiot. That man is a self-righteous, annoying, pompous idiot. The sweet, scintillating aroma of cinnamon buns filled the kitchen. The scintillating, sweet aroma of cinnamon buns filled the kitchen.

If the adjectives are not coordinate, don’t separate them with a comma.

The adorable, little boy was eating ice cream.
The adorable little boy was eating ice cream.

Comma Before But

Use a comma before the word but if it is joining two independent clauses:

Cleo is a good singer but she’s an even better dancer.
Cleo is a good singer, but she’s an even better dancer.
If but is not joining two independent clauses, leave the comma out.

My teacher is tough, but fair.
My teacher is tough but fair.
Life is, but a dream.
Life is but a dream.

Comma Before And

When you have a list that contains only two items, don’t use a comma before the and.

My dog Charlie is cute, and smart.
My dog Charlie is cute and smart.
Cleo’s favorite activities are singing on stage, and relaxing in the sunshine.
Cleo’s favorite activities are singing on stage and relaxing in the sunshine.

When correcting a comma splice, that is when joining two independent clauses with a coordinating conjunction, put the comma before and.

Commas with Lists

When you have a list that contains more than two elements, use commas to separate them.
Julie loves ice cream books and kittens.
Julie loves ice cream, books, and kittens.
Julie loves ice cream, books and kittens.
(The comma before the and in a list of three or more items is optional. See below under Serial Comma for more information.)

Your list might be made up of nouns, as in the example above, but it could also be made up of verbs, adjectives, or clauses. Imagine, for a moment, that you have just finished doing three chores. The chores were:

Cleaning the house and garage
Raking the lawn
Taking out the garbage
If you were to list these three chores in a sentence, you would write:
I cleaned the house and garage, raked the lawn, and took out the garbage.

or

I cleaned the house and garage, raked the lawn and took out the garbage.
Serial Comma (Oxford Comma)
As mentioned above, when you are listing three or more items, commas should separate each element of the list.

However, the final comma—the one that comes before the and—is optional. This comma is called the serial comma or the Oxford comma.

Mary needs bread, milk, and butter at the grocery store. (With serial comma)
Mary needs bread, milk and butter at the grocery store. (Without serial comma)
I still have to buy a gift, pack the suitcases, and arrange for someone to water the plants while we’re at the wedding. (With serial comma)

I still have to buy a gift, pack the suitcases and arrange for someone to water the plants while we’re at the wedding. (Without serial comma)

Whether or not you use the serial comma is a style choice. Many newspapers do not use it. Many trade books do use it. In your own writing, you can decide for yourself whether to use it or not—just be consistent.
Keep in mind, though, that occasionally the serial comma is necessary for clarity.

I dedicate this award to my parents, Jane Austen and Albert Einstein.

The sentence above will almost certainly cause readers to do a double-take. Without a serial comma, it looks like “Jane

Austen and Albert Einstein” is an appositive, rather than two more elements in a list. To put it another way, the writer seems to be saying that her parents are Jane Austen and Albert Einstein. A serial comma eliminates the possibility of misreading, so even if you’re not using serial commas in your writing, make an exception for sentences like this:

I dedicate this award to my parents, Jane Austen, and Albert Einstein.

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