What are the basic comma rules?

Use commas between items in a list, before and, but or so when they join two complete sentences, after an opening word or clause, around extra information, with yes, no and the names of people you are speaking to, and in dates, addresses and dialogue.

Do you put a comma before and in a list?

It is optional. The comma before and in a list is called the serial or Oxford comma. Many American writers use it, and schools in England usually leave it out. Choose one style and use it every time.

When should you use a comma before and?

In a compound sentence, when and joins two complete sentences: I finished my homework, and then I played outside. Leave it out when the part after and has no subject: I finished my homework and played outside.

Where does the comma go in a date?

In US style, between the day and the year: July 4, 2026. If the date sits in the middle of a sentence, add a comma after the year too: On July 4, 2026, we watched fireworks.

What is a comma splice?

Two complete sentences joined by just a comma, such as The bus was late, we walked. Fix it with a period, with a joining word after the comma (The bus was late, so we walked) or with a semicolon.

What grade learns comma rules?

Commas build up over several years. Common Core starts commas in dates and in a series in grade 1 and finishes the main rules in grade 5. In England, commas in lists begin in Year 2 and commas after fronted adverbials come in Year 4.

Is there a free comma worksheet with answers?

Yes. Use the Print a worksheet button on this page for a fresh worksheet each time, with an answer key showing answers only or answers with worked steps.

Grades 1 to 5 (Years 2 to 6 in England)

Comma rules: when to use a comma

A comma marks a short pause and keeps words that belong together in the right groups. This page explains the main comma rules, from commas in a series to commas in dialogue, with examples for each, then gives you free practice and a printable comma worksheet with an answer key.

The rule, step by step

Put a comma between the items in a list of three or more: red, blue and green.
Put a comma before a joining word such as and, but or so when it joins two complete sentences.
Put a comma after an opening word, phrase or clause, such as Suddenly or When the bell rang.
Use commas to set off yes and no, the name of someone you are speaking to, and tag questions such as isn't it.
Put a comma between the day and the year in a date, and between a city and its state or country.
Use a comma to separate spoken words from words like said in dialogue.

CCSS L.2.2.ACCSS L.2.2.BCCSS L.3.2CCSS L.5.2.ACCSS L.3.2.CCCSS L.4.2.CEngland: Y2 GPSEngland: Y2 GPS (commas in lists)England: Y3 GPSEngland: Y3 GPS (inverted commas)

Worked example

Add the missing comma: Before the game started the players stretched their legs.

Find the main clause, the part that could stand alone as a sentence: the players stretched their legs.
Before the game started is an opening clause. It cannot stand alone as a sentence.
When an opening clause comes before the main clause, a comma goes where the opening clause ends.
The comma goes after started, not after Before and not after players.
Before the game started, the players stretched their legs.

Practice now

Question 1 of 100 correct

Does this sentence need a comma before the joining word? The puppy was tired but it still wanted to play.

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What a comma does

A comma tells the reader how the words in a sentence group together. Read these two sentences aloud: Time to wash, Max. Time to wash Max. In the first, someone is talking to Max. In the second, Max is the one getting washed. Most comma rules come down to that same job: separating parts of a sentence so the meaning is clear.

A comma is not a period (a full stop in the UK). It never ends a sentence, and joining two complete sentences with only a comma is a mistake called a comma splice. Use a period instead, or add a joining word after the comma.

Commas in a series

When you list three or more things, put a comma between them, and join the last two with and or or: We need flour, eggs, milk and butter. Two items need no comma at all: We need flour and eggs.

Many American writers and style guides also put a comma before the and: flour, eggs, milk, and butter. This is called the serial comma or Oxford comma. Schools in England usually teach the list without it. Both are correct if you use one style every time, and some practice questions say which style they want. The serial comma can also prevent confusion. Compare I made cards for my grandparents, Mrs. Ortiz, and Mr. Lee with the same list minus the last comma. Without it, a reader might think Mrs. Ortiz and Mr. Lee are the grandparents.

When to use a comma: the main rules

In a compound sentence. If and, but, or, so or yet joins two complete sentences, put a comma before it: The rain stopped, so we biked to the library. If the second part has no subject of its own, leave the comma out: We biked to the library and borrowed three books.
After an opening word, phrase or clause: Suddenly, the lights flickered. After recess, we have spelling. If you finish early, read quietly.
With yes, no and names of people you are speaking to: Yes, I packed my lunch. Ava, your mom is here. Is that your bike, Theo?
Before a tag question: You fed the fish, didn't you?
In dates and places: May 9, 2027 and Denver, Colorado. In the middle of a sentence, add another comma after the year or the state: We moved to Denver, Colorado, last spring.
In friendly letters, after the greeting (Dear Aunt Rosa,) and after the closing (Your nephew,).
Around extra information: Mr. Patel, our principal, plays the trumpet. Take out the words between the commas and the sentence still works.
In dialogue: Mom said, "Dinner is ready." When the spoken words come first, the comma goes inside the quotation marks: "Dinner is ready," said Mom.

When not to use a comma

Between a subject and its verb. The boy in the red coat, waved is wrong. It should be The boy in the red coat waved.
Before the first item in a list. My favorite colors are, purple, teal and gold is wrong.
After the and in a list. Red, white and, blue is wrong.
Between two complete sentences with no joining word. That is a comma splice.

How it is taught in school

In the US, Common Core introduces commas in dates and between single words in a series in grade 1 (L.1.2.c) and commas in the greetings and closings of letters in grade 2 (L.2.2.b). Grade 3 adds commas in addresses and in dialogue (L.3.2.b and L.3.2.c), and grade 4 adds a comma before a coordinating conjunction in a compound sentence (L.4.2.c). Grade 5 covers commas after introductory elements and with yes, no, tag questions and direct address (L.5.2.b and L.5.2.c).

In England, Year 2 pupils use commas to separate items in a list. Year 4 adds commas after fronted adverbials, which are opening words and phrases such as Later that day, and a comma after the reporting clause in direct speech. UK schools call quotation marks inverted commas or speech marks. Year 5 adds commas to clarify meaning or avoid ambiguity.

Helping at home

Read a sentence aloud with and without a comma and talk about how the meaning changes. Funny misreadings are the ones children remember.
Ask your child to read their own writing aloud. A natural pause often signals a comma or a period, though a pause alone is not a rule.
Practice one rule at a time: lists first, then opening phrases, then compound sentences.
Try the practice set below, then print a fresh comma worksheet with an answer key.

Common mistakes

Joining two complete sentences with only a comma: It was late, we went home. Use a period, or add a joining word: It was late, so we went home.
Putting the comma after the joining word instead of before it: I was tired but, I kept running.
Adding a comma between the subject and the verb.
Leaving out the comma after an opening clause, which can cause a misreading: While Mom was cooking the dog begged for scraps.
Putting the comma outside the quotation marks in dialogue: "I'm ready", said Leo. It should be "I'm ready," said Leo.
Forgetting the comma before the name of someone you are speaking to: Thanks Grandpa should be Thanks, Grandpa.

Questions people ask

What are the basic comma rules?: Use commas between items in a list, before and, but or so when they join two complete sentences, after an opening word or clause, around extra information, with yes, no and the names of people you are speaking to, and in dates, addresses and dialogue.
Do you put a comma before and in a list?: It is optional. The comma before and in a list is called the serial or Oxford comma. Many American writers use it, and schools in England usually leave it out. Choose one style and use it every time.
When should you use a comma before and?: In a compound sentence, when and joins two complete sentences: I finished my homework, and then I played outside. Leave it out when the part after and has no subject: I finished my homework and played outside.
Where does the comma go in a date?: In US style, between the day and the year: July 4, 2026. If the date sits in the middle of a sentence, add a comma after the year too: On July 4, 2026, we watched fireworks.
What is a comma splice?: Two complete sentences joined by just a comma, such as The bus was late, we walked. Fix it with a period, with a joining word after the comma (The bus was late, so we walked) or with a semicolon.
What grade learns comma rules?: Commas build up over several years. Common Core starts commas in dates and in a series in grade 1 and finishes the main rules in grade 5. In England, commas in lists begin in Year 2 and commas after fronted adverbials come in Year 4.
Is there a free comma worksheet with answers?: Yes. Use the Print a worksheet button on this page for a fresh worksheet each time, with an answer key showing answers only or answers with worked steps.

Updated November 1, 2026.

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