The Period (Full Stop)
The period (called a full stop in British English) is the most basic punctuation mark. It has one main job: to end a declarative sentence.
- _The sun rises in the east . _
- _She walked to the store . _
- _I enjoy reading books . _
Do not use a period after:
- Questions: What time is it? (Use a question mark.)
- Exclamations: Watch out! (Use an exclamation mark.)
- Headlines, titles, or labels: Chapter 1: Introduction (Often omitted.)
The Comma
The comma indicates a short pause in a sentence. It has several important uses.
1. Separating items in a list: Use commas to separate three or more items in a series.
- I bought apples, oranges, bananas, and grapes. (Oxford comma included)
- She is smart, kind, and funny.
2. Joining independent clauses: Use a comma before a coordinating conjunction (and, but, or, so, yet, for, nor) when joining two complete sentences.
- I wanted to go out, but it was raining.
- She studied hard, so she passed the exam.
3. After introductory elements: Use a comma after introductory words, phrases, or clauses.
- However, I disagree with your conclusion.
- After the meeting ended, we went for lunch.
- Well, that is an interesting point.
4. Setting off non-essential information: Use commas to set off information that is not essential to the meaning of the sentence.
- My brother, who lives in London, is a doctor. (The clause adds extra information.)
- The Eiffel Tower, which is in Paris, is beautiful.
Common Comma Errors:
- Comma splice: I like coffee, I drink it every day. ❌ (Use a period or semicolon instead.)
- Missing comma in a list: I like apples oranges and bananas. ❌