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Period ( . )
Full Stop, Full Point
Primary Uses
- End declarative sentences
- End imperative sentences
- Abbreviations (Mr., Dr., etc.)
- Decimal points (3.14)
Examples
She went to the store.
Please close the door.
Dr. Smith arrived at 3 p.m.
⚠️ Common Mistakes: Don't use periods after headings, titles (unless part of the title), or acronyms (NASA, FBI).
,
Comma ( , )
The most versatile punctuation mark
Main Rules
- Separate items in a list
- Join independent clauses with conjunctions
- Set off introductory elements
- Set off non-essential information
- Separate coordinate adjectives
Examples
Apples, oranges, and bananas
I wanted to go, but I was tired.
After dinner, we watched a movie.
My brother, who lives in Paris, is visiting.
Oxford Comma
Optional before "and" in lists. Adds clarity.
Common Error
Comma splices: joining clauses without conjunction.
;
Semicolon ( ; )
Stronger than a comma, weaker than a period
Uses
- Join related independent clauses
- Separate items in complex lists
- Use with transitional expressions
Examples
I have a test tomorrow; I need to study.
The team visited Paris, France; Rome, Italy; and Madrid, Spain.
I love coffee; however, I try to limit my intake.
:
Colon ( : )
Introduces or emphasizes what follows
Uses
- Introduce a list
- Introduce an explanation
- Introduce a quotation
- Separate title and subtitle
- Time notation (10:30)
Examples
You need three things: patience, practice, and persistence.
Remember this: always be kind.
The meeting starts at 9:00 AM.
'
Apostrophe ( ' )
Shows possession or omission
Rules
- Singular possessive: cat's toy
- Plural possessive: cats' toys
- Contractions: don't (do not)
- Plurals of letters: Mind your p's and q's
Examples
Sarah's book is on the table.
The students' projects were excellent.
It's (it is) time to go.
❌ Common Errors: Don't use apostrophes for plural nouns (apples, not apple's), possessive pronouns (its, yours, theirs), or decades (1990s, not 1990's unless possessive).
" "
Quotation Marks ( " " )
Double quotes for direct speech and titles
Uses
- Direct quotations
- Titles of short works
- Words used in special ways
- Scare quotes (for irony)
Single Quotes ( ' ' )
Use within double quotes for quotations within quotations.
Examples
She said, "I'll be there soon."
Read "The Raven" by Edgar Allan Poe.
He called it a "revolutionary" idea.
She asked, "Did he say 'I love you'?"
Punctuation Placement: Commas and periods go inside quotes in US English.
( )
Parentheses ( )
Enclose supplemental information
Uses
- Additional explanations
- Acronym definitions
- Citations (APA, MLA)
- Numbered lists in text
- Mathematical expressions
Examples
The conference (which was held online) was successful.
NASA (National Aeronautics and Space Administration)
Several studies support this claim (Smith, 2020; Jones, 2021).
—
Em Dash ( — )
Creates emphasis or interruption
Uses
- Emphasize parenthetical information
- Indicate interruption or abrupt change
- Replace commas, parentheses, or colons
- Create dramatic effect
En Dash ( – )
Used for ranges: pages 10–20, June–August, New York–London flight.
Examples
She had one goal—to win.
The answer—though unexpected—made perfect sense.
"I was trying to—" he began, but she interrupted.
Keyboard Shortcut: Alt+0151 (Windows) or Option+Shift+- (Mac)
-
Hyphen ( - )
Joins words or parts of words
Uses
- Compound words: well-known
- Prefixes before proper nouns: pre-Columbian
- Numbers 21–99: twenty-one
- Line breaks at syllables
- Avoid ambiguity: re-sign vs. resign
Examples
She is a state-of-the-art engineer.
The mid-September weather was perfect.
I have thirty-five books on my shelf.
…
Ellipsis ( … )
Indicates omission or trailing off
Uses
- Omit words from quotations
- Indicate pause or hesitation
- Show trailing off in dialogue
- Create suspense or uncertainty
Examples
"Four score and seven years ago … a new nation …"
I was thinking … maybe we should …
The door creaked open, and then …
Formatting: Use three dots with spaces ( … ) or ellipsis character.
?
Question Mark ( ? )
Ends direct questions
Rules
- End direct questions
- Use for rhetorical questions
- Place inside quotes if part of quote
- Use for questioning tone in parentheses
Examples
What time is the meeting?
Who doesn't love chocolate?
She asked, "Are you coming?"
Spanish: Use inverted question mark at beginning: ¿Cómo estás?
!
Exclamation Point ( ! )
Expresses strong emotion
Uses
- Express excitement or surprise
- Indicate shouting or emphasis
- Use with interjections
- End imperative sentences for emphasis
Examples
What a beautiful day!
Stop!
Wow! That's amazing!
⚠️ Use Sparingly: In formal writing, use exclamation points rarely. Multiple exclamation points (!!) are informal and best avoided in professional contexts.