Commas

Commas are used to indicate pauses, separate ideas, and clarify meaning in a sentence. Correct usage prevents confusion and ensures smooth reading.

Definition / Explanation

A comma (,) is a punctuation mark that separates elements within a sentence, such as items in a list, clauses, or introductory phrases.

Rules / Guidelines

• Use commas to separate items in a series: Apples, oranges, and bananas.
• Use commas before coordinating conjunctions (and, but, or, nor, for, so, yet) joining independent clauses: I wanted to go, but it started raining.
• Use commas after introductory words, phrases, or clauses: After the meeting, we went out for lunch.
• Use commas to set off nonessential information: My brother, who lives in New York, is visiting.
• Use commas with direct addresses, dates, and numbers: Lisa, can you help me?; July 4, 2025; 1,000

Examples

Series: I bought pens, pencils, and erasers.
Independent Clauses: She was tired, but she finished her homework.
Introductory Phrase: In the morning, I like to drink coffee.
Nonessential Information: My car, which is red, is parked outside.
Direct Address / Dates / Numbers: John, please come here. / July 4, 2025 / 3,456

Practice Exercises

1. Insert commas where necessary: "I bought apples oranges and bananas."
2. Insert commas where necessary: "After the movie we went home."
3. Correct the sentence: "My sister who lives in Boston is coming."
4. Insert commas where necessary: "Yes I will attend the meeting."
5. Identify the correct comma usage: "The package arrived on Monday October 5 2025."

Answers / Explanation

1. I bought apples, oranges, and bananas.
2. After the movie, we went home.
3. My sister, who lives in Boston, is coming.
4. Yes, I will attend the meeting.
5. The package arrived on Monday, October 5, 2025.