Commas help organize your ideas. They show pauses, separate parts of a sentence, and keep things clear for your reader. Here are the most useful rules.
1. Use a comma before and, but, or, so (if both sides are complete sentences)
- He opened the window, and a bird flew in.
- I studied all night, but I still felt nervous.
2. Use a comma after an introduction
- After lunch, we went back to work.
- During the meeting, I took notes.
3. Use commas in a list (three or more items)
- I bought eggs, milk, and bread.
- She likes singing, dancing, and acting.
The comma before the last “and” is optional: eggs, milk and bread is also correct.
4. Use commas around extra information
If you can remove the words and the sentence still says who or what you mean, put commas around them.
- My brother, who lives in Canada, is visiting soon.
- That movie, which you love, is on TV tonight.
5. Use commas around a second name for the same person or thing
- Paris, the capital of France, is a beautiful city.
- Sam, my guitar teacher, gave me a free lesson.
6. Use commas in direct address (speaking to someone)
- Emma, could you help me?
- Thanks for coming, everyone.
7. Use commas in quotes
- He said, “I’ll be there soon.”
- “I’m tired,” she whispered, “but I’ll finish this.”
8. Use commas in dates, addresses, and big numbers
- We met on June 4, 2023, in New York.
- Send it to 22 Maple Street, Austin, TX 78701.
- The prize is $10,000.
