Punctuation: Use of Comma
Comma (,)
A comma is used to show the difference between two separate ideas or elements within a sentence. Commas have other uses as well, as they can be used to separate numbers, and write dates.
The comma rules and examples:
(1) Add a comma when two separate sentences are combined
Example: We purchased some cheese, and we purchased some fruit.
(2) Use commas between words in a series. Notice that a comma does not follow the last word in the series
Example: He was tall, dark, and handsome.
(3) Use a comma to separate an introductory element from the rest of the sentence
Example: As the day came to an end, the firefighters put out the last spark.
(4) Use the comma to set off the words “yes” and “no”.
Example: No, thank you.
(5) Use a comma to set off a tag question from the rest of the sentence.
Example: She is your sister, isn’t she?
(6) Use a comma to indicate a direct address.
Example: Is that you, Mary?
(7) Add a comma when a participle phrase clause is used.
Example: Walking slowly, I could see the beautiful flowers.
(8) Use a comma to separate parts of the date.
Example: Tuesday, October 10, 2017, was when I graduated.
