Introduction
Punctuation tells the reader where to pause, where a thought ends and how the parts of a sentence relate. The main marks are: period, comma, semicolon, colon, apostrophe, quotation marks, exclamation mark, question mark, hyphen, and dash.
| Mark | Name | Primary Use |
|---|---|---|
| . | Period / Full stop | Ends a declarative sentence |
| , | Comma | Separates clauses, list items, and introductory phrases |
| ; | Semicolon | Joins two closely related independent clauses |
| : | Colon | Introduces a list, explanation, or quotation |
| ' | Apostrophe | Contractions and possession |
| ! | Exclamation mark | Expresses strong emotion or command |
| ? | Question mark | Ends a direct question |
| - | Hyphen | Joins compound words or word parts |
| — | Em dash | Adds emphasis or an interruption |
| " " / ' ' | Quotation marks | Enclose direct speech and quotations: She said, "I'm tired." American English prefers double quotes; British English often uses single quotes. |
Comma Rules
Five rules cover most comma use:
| Rule | Example |
|---|---|
| Before coordinating conjunction (joining two clauses) | I was tired, but I kept going. |
| After introductory phrase or clause | After the meeting, we went for coffee. |
| Separating items in a list | I bought bread, milk, eggs, and butter. |
| Around non-defining relative clause | My uncle, who lives in Paris, called me. |
| Around inserted phrases (parenthetical) | This theory, however, has been disproved. |
- She was tired, she went to bed.She was tired; she went to bed.comma splice - use semicolon or conjunction
- I love cooking my family and my pets.I love cooking, my family, and my pets.without commas, it says you cook your family
Apostrophes
Apostrophes are used for two purposes only: contractions and possession. Never use an apostrophe to form a plural.
| Use | Rule | Example |
|---|---|---|
| Contraction | Replaces omitted letters | it's, can't, won't, I've, they're |
| Singular possession | noun + 's | the dog's bowl, Maria's book |
| Plural possession (ends in s) | noun + ' | the teachers' lounge, the students' work |
| Irregular plural possession | noun + 's | the children's toys, the men's team |
- I love apple's.I love apples.no apostrophe for plurals
- Its raining.It's raining.it's = it is
- The dog's are barking.The dogs are barking.
Semicolons and Colons
| Mark | Use | Example |
|---|---|---|
| ; | Join two closely related independent clauses | She studied hard; she passed easily. |
| ; | Before conjunctive adverbs (however, therefore) | It rained; however, we went out. |
| ; | Separate list items that contain commas | The team included Ali, manager; Sam, designer; and Jo, developer. |
| : | Introduce a list | She packed three things: a map, a compass, and food. |
| : | Introduce an explanation or elaboration | There is one rule: be honest. |
| : | After the greeting in a formal American business letter (British English uses a comma or no punctuation) | Dear Sir or Madam: |
Practice
Which mark joins two closely related independent clauses?
Which sentence correctly fixes a comma splice?
Which is correct?
Which punctuation introduces a list?
Which mark ends a declarative sentence?
Which mark introduces an explanation or elaboration?
Which mark joins compound words?
This theory, ___, has been disproved.
'After the meeting, we went for coffee.' Why the comma?
'My uncle, who lives in Paris, called me.' Why the commas?
Which mark separates list items that themselves contain commas?
Dear Sir or Madam___ (formal American business letter)
Which mark is used to add emphasis or to show an interruption in the middle of a sentence?
Which sentence punctuates direct speech correctly?
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