English Composition 101: Grammar and Style - Punctuation Period Comma Semicolon Colon Apostrophe Quotation Marks Parentheses Brackets Ellipsis Dash Hyphen

Study Guide: Mastering Punctuation

What It Is

Punctuation is the use of marks to clarify the meaning of written language. A period (.) is used to end a sentence, while a comma (,) separates items in a list or sets off nonessential clauses. Semicolons (;) join two independent clauses, and colons (:) introduce lists or explanations. Apostrophes (') indicate possession or contraction, while quotation marks ("") set off direct speech. Parentheses (()) and brackets [ ] provide additional information, and ellipses (...) indicate trailing off. Dashes (-) and hyphens (-) are used for different purposes.

Example: "The student, who was tired, fell asleep during the lecture." (Comma usage)

In academic and professional writing, proper punctuation is crucial for clarity and credibility. Misused punctuation can lead to confusion and undermine the writer's message.

Core Principles

• Period (.): ends a sentence
  • Example: "I went to the store." (correct) vs. "I went to the store." (incorrect, missing period)
• Comma (,): separates items in a list or sets off nonessential clauses
  • Example: "I like apples, bananas, and oranges." (correct) vs. "I like apples bananas and oranges." (incorrect)
• Semicolon (;): joins two independent clauses
  • Example: "I have visited many cities; Paris is my favorite." (correct) vs. "I have visited many cities; Paris is my favorite." (incorrect, missing semicolon)
• Colon (:): introduces lists or explanations
  • Example: "My favorite foods are: pizza, sushi, and tacos." (correct) vs. "My favorite foods are pizza, sushi, and tacos." (incorrect)
• Apostrophe ('): indicates possession or contraction
  • Example: "The cat's toy" (correct) vs. "The cats toy" (incorrect)
• Quotation marks (""): set off direct speech
  • Example: "She said, 'I love this book.'" (correct) vs. "She said 'I love this book.'" (incorrect)
• Parentheses (()): provide additional information
  • Example: "I have (three) dogs." (correct) vs. "I have three dogs." (incorrect)
• Brackets [ ]: provide additional information
  • Example: "The book [by John Smith] is excellent." (correct) vs. "The book by John Smith is excellent." (incorrect)
• Ellipsis (...): indicates trailing off
  • Example: "I have so much to do... but I'm tired." (correct) vs. "I have so much to do but I'm tired." (incorrect)
• Dash (-): used for different purposes (e.g., to set off a parenthetical remark)
  • Example: "I went to the store – and bought milk." (correct) vs. "I went to the store and bought milk." (incorrect)
• Hyphen (-): used to join words or indicate a range
  • Example: "self-portrait" (correct) vs. "self portrait" (incorrect)
• MLA and APA formatting: use a specific citation style for academic writing
  • Example: MLA: (Author's Last Name, First Name, Title, Publisher, Year) vs. APA: (Author's Last Name, First Initial, Title, Publisher, Year)

Common Writing Errors

• Error: "I went to the store, and I bought milk."
• Why it fails: This sentence is a run-on and lacks proper punctuation.
• Correction: "I went to the store, and I bought milk." (revised sentence with a comma)
• Error: "The book 'To Kill a Mockingbird' is excellent."
• Why it fails: This sentence lacks quotation marks around the title.
• Correction: "The book 'To Kill a Mockingbird' is excellent." (revised sentence with quotation marks)
• Error: "I have visited many cities; Paris is my favorite city."
• Why it fails: This sentence is a run-on and lacks proper punctuation.
• Correction: "I have visited many cities; Paris is my favorite city." (revised sentence with a semicolon)

Quick Application

1. Write a thesis statement arguing that college tuition should be free.
   • Model answer: "College tuition should be free because it would increase accessibility and reduce student debt."
   • Explanation: This thesis statement clearly states the claim and provides a roadmap for the argument.
2. Write a sentence using a colon to introduce a list of favorite foods.
   • Model answer: "My favorite foods are: pizza, sushi, and tacos."
   • Explanation: This sentence uses a colon to introduce a list of favorite foods.
3. Write a sentence using an apostrophe to indicate possession.
   • Model answer: "The cat's toy is missing."
   • Explanation: This sentence uses an apostrophe to indicate possession.

Last-Minute Revision

• Use a comma to separate items in a list: "I like apples, bananas, and oranges."
• Use a semicolon to join two independent clauses: "I have visited many cities; Paris is my favorite."
• Use quotation marks to set off direct speech: "She said, 'I love this book.'"
• Use parentheses to provide additional information: "I have (three) dogs."
• Use brackets to provide additional information: "The book [by John Smith] is excellent."
• Use an ellipsis to indicate trailing off: "I have so much to do... but I'm tired."
• Use a dash to set off a parenthetical remark: "I went to the store – and bought milk."
• Use a hyphen to join words or indicate a range: "self-portrait"
• Use MLA or APA formatting for academic writing: (Author's Last Name, First Name, Title, Publisher, Year)
• Use a period to end a sentence: "I went to the store."
• Use a comma to set off a nonessential clause: "The student, who was tired, fell asleep during the lecture."