When to Use Apostrophe: Avoid Common Grammar Mistakes

when to use apostrophe
by David Harris // January 28  

Apostrophes can be confusing among writers. They serve several critical functions in the English language, most commonly to indicate possession or form contractions. Knowing when to use this punctuation mark can enhance your writing and help you communicate more clearly. Let’s break down the rules governing apostrophes so you can use them effectively in your writing.

Understanding Possession

Singular Nouns and Possession

When you want to show that something belongs to someone or something, you use an apostrophe followed by an “s” for singular nouns. For example:

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  • The dog’s leash: The leash belongs to one dog.

If the singular noun ends in “s,” you typically add an apostrophe and another “s.” For instance:

  • James’s book: This example implies the book belongs to James.

However, some style guides suggest simply adding an apostrophe after the “s”:

  • James’ book: This still indicates that the book belongs to James.

Plural Nouns and Possession

For plural nouns that already end in “s,” you only add an apostrophe after the “s”:

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  • The teachers’ lounge: Multiple teachers share the lounge.

If the plural noun does not end in “s,” you still add an apostrophe and an “s”:

  • Women’s rights refer to the rights that apply to women.

Contractions: Combining Words

Apostrophes also form contractions, where two words are combined into one by omitting some letters. This method is popular in informal writing and dialogue. Here are several examples:

  • Cannot becomes can’t: The apostrophe replaces the letters “no”.
  • Do not become don’t: Here, the apostrophe replaces “o”.

Contrarily, contractions are best avoided in formal writing, unless quoting.

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Common Confusion: It’s vs. Its

One of the most commonly confused instances of apostrophes is between “it’s” and “its.”

  • “It’s” is a contraction for “it is” or “it has.” For example, “It’s raining outside” means “It is raining outside.”
  • Its: This is a possessive pronoun that shows ownership. For example, “The dog chased its tail” means the tail belongs to the dog.

Remembering this distinction can save you from the wrath of grammar nazis everywhere.

Unique Cases: Singular Nouns Ending in ‘S’

Sometimes the rules seem to blur, especially with names or terms that end in “s.” The general format for showing possession remains consistent, but it can vary by style guide.

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Example for traditional style:

  • Charles’s car: This indicates possession and follows the basic rule.

Example for a more modern or alternative style:

  • Charles’ car: This also indicates possession, following a more minimalist approach.

Both options are correct, but it’s essential to stay consistent throughout your writing.

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The Apostrophe in Plurals: Not for Everything

It’s crucial to clarify that apostrophes do not make words plural. Adding an apostrophe before an “s” to pluralize a word is incorrect. For example:

  • Incorrect: There were many cat’s at the shelter.
  • Correct: There were many cats at the shelter.

Apostrophes should only indicate possession or the omission of letters in contractions, not pluralization.

Using Apostrophes in Names: Possessive Forms

When dealing with names that end in “s,” possessive forms can get tricky. You can either treat it like a standard singular noun or adhere to specific style guidelines.

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  • Boys’ basketball: Possession by multiple boys.
  • Chris’s bike or Chris’ bike: Depending on the style chosen.

Clarifying these possessives will help you maintain accuracy and readability in your writing.

The Use of Apostrophes in Time Expressions

Apostrophes can also express time-related possession, suggesting a relationship by measurement.

  • A day’s work refers to the work completed within a single day.
  • Two weeks’ notice: This means a two-week notice period.

Use these expressions with a specific noun to make duration and duties clear.

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Apostrophe Uses in Indicating Joint Possession

When discussing items owned jointly, only the last name in a series requires an apostrophe. Here’s an example:

  • David and Lisa’s house: This phrase means David and Lisa share ownership of the house.

If each individual owns a separate item, both names should show possession:

  • David’s and Lisa’s houses: This phrase means David and Lisa each own a separate house.

Understanding this difference can prevent a great deal of confusion in your writing.

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Avoiding Common Apostrophe Errors

Writers often make simple mistakes when using apostrophes. Here are a few frequent blunders and ways to avoid them:

  1. Mixing it’s and its: Remember that “it’s” has an apostrophe (it is), while “its” shows possession.
  2. Plurals with Apostrophes: Don’t add apostrophes when simply making something plural.
  3. Using apostrophes with non-possessive words: Some words don’t need apostrophes, such as acronyms and numbers: “1960s”.

By ensuring your writing is correct, you create a more professional appearance.

Apostrophes in Quotations

When quoting someone directly, be mindful of how the apostrophe interacts with the quotation marks.

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  • “She said, ‘I’ll be there soon,’ and left.” This sentence demonstrates correct apostrophe use in conjunction with quotation marks.

Apostrophes in Internet Speak and Informal Writing

In casual communication, you may encounter a variety of non-standard uses of apostrophes. You might see:

  • What’s up?: A common contraction that has made its way into everyday conversation.

People often accept these choices in informal contexts, but professional writing calls for their avoidance.

Additional Information

Apostrophes can be tricky little markers that many people misunderstand.

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  • Contractions and Possession: Most recognize that apostrophes denote possession, as in “Sarah’s book.” Apostrophes also appear in contractions, such as “can’t” for “cannot.” This dual purpose is a common source of confusion.
  • It’s vs. Its: The contraction “it’s” means “it is,” while “its” signifies possession. For example, “The cat licked its paws” means the paws belong to the cat, whereas “It’s a sunny day” states the condition.
  • Plural Possessives: When making plural nouns possessive, add an apostrophe after the “s.” For instance, “the dogs’ owner” refers to the owner of multiple dogs. Ignoring this can lead to awkward and unclear phrases.
  • Decades and Letters: Apostrophes also indicate omitted numbers in decades, such as the ’90s, or to form plurals of single letters, such as “Mind your p’s and q’s.”
  • Joint Possession: When two or more people own something together, only the last person’s name gets an apostrophe. For example, “Jack and Jill’s bucket” shows that the bucket belongs to both Jack and Jill. If each owned their own bucket, you’d say “Jack’s and Jill’s buckets.”
  • Common Nouns: Some common nouns can also take an apostrophe for possession, like “the enemy’s camp.” Be sure not to confuse it with the plural form, where no apostrophe is needed.
  • Avoiding Apostrophes in Plurals: Apostrophes do not turn regular nouns plural, so avoid writing “CD’s” when you want to refer to more than one compact disc. Instead, stick with “CDs.”
  • Omitted Letters: Certain brand names or informal phrases may use apostrophes to indicate omitted letters, like “rock ‘n’ roll.”

Frequently Asked Questions (FAQs) Related to When To Use Apostrophe

Q. When should I use an apostrophe to show possession?
A. Use an apostrophe to indicate possession when something belongs to someone or something. For example, “Sarah’s book” shows that the book belongs to Sarah.

Q. Where do I place the apostrophe for plural nouns that end in “s”?
A. For plural nouns that end in “s,” add just an apostrophe at the end. For example, “the dogs’ owner” indicates that the owner belongs to multiple dogs.

Q. How do I use an apostrophe with singular nouns that end in “s”?
A. For singular nouns ending in “s,” you can add an apostrophe followed by another “s,” or just an apostrophe, depending on style guides. For instance, “James’s car” or “James’ car” can be correct.

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Q. When is it appropriate to use an apostrophe in contractions?
A. Use an apostrophe in contractions to show omitted letters. For example, “don’t” is a contraction for “do not,” where the apostrophe replaces the missing “o.”

Q. What is the rule for using apostrophes in joint possession?
A. When two or more people own something together, add an apostrophe “s” to the last name only. For example, “Mark and Jessica’s house” indicates that the house belongs to both Mark and Jessica.

Q. Should I use an apostrophe when a noun is plural but not possessive?
A. No, do not use an apostrophe for regular plural nouns that are not showing possession. For example, “the books” does not require an apostrophe.

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Q. Can I use an apostrophe for decades?
A. You can use an apostrophe to form a shortened version of a decade. For example, “the ’90s” indicates the 1990s, with the apostrophe replacing the first two digits.

Q. How do I handle apostrophes with collective nouns?
A. Use an apostrophe for collective nouns only if you are showing possession. For example, “the team’s uniforms” shows that the uniforms belong to the team.

Q. Are there any exceptions to the apostrophe rules?
A. Yes, some exceptions include particular proper nouns or fixed phrases. Always look up specific cases, as rules can vary based on style.

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Q. Is it correct to use an apostrophe with “its”?
A. Use “its” without an apostrophe to indicate possession, as in “the cat licked its paws.” “It’s” with an apostrophe means “it is.”

Conclusion

Understanding when to use an apostrophe is key to clear and correct writing. Whether you’re showing possession, making a contraction, or indicating plural forms in specific situations, the apostrophe plays an essential role in conveying your intended message. By mastering these rules, you enhance your writing and avoid common errors. So, keep this guide handy and watch your punctuation skills flourish!

About the Author

David Harris is a content writer at Adazing with 20 years of experience navigating the ever-evolving worlds of publishing and technology. Equal parts editor, tech enthusiast, and caffeine connoisseur, he’s spent decades turning big ideas into polished prose. As a former Technical Writer for a cloud-based publishing software company and a Ghostwriter of over 60 books, David’s expertise spans technical precision and creative storytelling. At Adazing, he brings a knack for clarity and a love of the written word to every project—while still searching for the keyboard shortcut that refills his coffee.

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