| A | B |
|---|
| Use commas to separate items in a series | Yesterday was cold, wet, and windy. |
| Use comma to separate two or more adjectives that come before a noun. | She wore a bright, red dress to the party. |
| Use a comma before "and, "but", "for", "or", "nor", "so", and "yet" when they join parts of a compound sentence. | Congress passed the bill, but the President veteoed it. |
| Use commas to set off an expression that interrupts a sentence. | Will you please read the next paragraph, Jill? |
| Use commas to set off appositive phrases that are not needed to understand the meaning of a sentence. | The Principal, Mr. Jones, makes the morning announcements. |
| Use commas to separate items in dates. | Friday, May 25, will be the last day of school. |
| Use commas to separate items in addresses. | The building was located at 2025 Powder Springs Road, Marietta, Georgia. |
| Use a comma after words such as "well", "yes", "no", and "why" when they begin a sentence. | Yes, you may go to the movies. |
| Use commas to set off words used in direct address. | You are right, John, you did finish reading. |
| Use a commas after the salutation of a friendly letter. | Dear Sally,... |
| Use a comma after the closing of a letter. | Sincerely, ... |
