Grammar 9 min read

Quick and Easy Apostrophe Rules Guide

Main Apostrophe Takeaways:

  • Apostrophes have three main uses: to show ownership, omissions, and plural letters, numbers, and symbols
  • An apostrophe stands in for the missing letter(s) in a contraction like don’t or can’t.
  • If something is plural and showing possession, put an apostrophe after the “s.” You can also add another ‘s’ after the apostrophe, but it isn’t usually required.
  • If something is plural but not possessive, you don’t need an apostrophe.
  • Only use an apostrophe with last names ending in ‘s’ when they show possession.
  • To shorten decades, replace the century with an apostrophe and add an ‘s’ at the end of the number. Never put the apostrophe before or after the ‘s’.

Confused? Let’s look at these apostrophe rules with examples of each one in action. By the time you finish reviewing this quick guide, you’ll know when to use this versatile punctuation mark for contractions, dates, possession, last names, and words that end in ‘s’.

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What are the 3 Uses of Apostrophes?

Apostrophes have three main functions in the English Language: 1) indicate possession; 2) show omissions of letters in contractions; and 3) show when letters, numbers, and symbols are plural. You can find apostrophes in contractions, dates, and holiday names. Although they look similar, apostrophes and commas are not the same. A comma sits at the bottom of a word while an apostrophe hovers at the top.

Apostrophe is a punctuation mark that serves 3 different purposes in English
Do you know that apostrophe is also a diacritical mark? Meaning, it can also be used to give a character or letter a specific phonetic value.

1. Apostrophes and Possession

Ownership, also known as possession in the grammar world, often requires apostrophes. This is true for nouns and pronouns. Depending on whether your noun is singular or plural, you’ll use some form of an apostrophe and s.

Possessive words and phrases confuse many people, even self-proclaimed grammar nerds. You must know when to use ‘s or s’, plus when to use an apostrophe after an ‘s’ name.

Singular nouns, such as cat or car, typically get an apostrophe plus an ‘s’ when they become plural.

Your cat’s food bowl is empty.
Your car’s windshield is cracked.

This rule also applies when making proper nouns possessive.

Karen’s hair is cut in a perfectly styled bob.
Miguel’s marketing proposals are always submitted before the deadline.

Plural nouns, such as twins and teachers, usually don’t need an extra ‘s’. Add an apostrophe after the ‘s’ to show ownership, and avoid using ‘es’.

Apostrophe is a punctuation that you can use to express ownership.
Apostrophe is a punctuation that you can use to express ownership.
Change your twins’ dirty diapers, not your twin’s or twinses diapers.
Stay out of the teachers’ lounge if you’re a student or parent.

Plural nouns that don’t end in ‘s’ often get an apostrophe and an ‘s’.

Shop for high heels in the women’s section.
Find toys near the children’s books and clothes.

Personal pronouns don’t require apostrophes when they become possessive. The electronic device you’re reading this grammar guide on is yours, not your’s or yours’. Gifts a loved one receives are his, hers, or theirs.

When to use an Apostrophe With Last Names

Many people can’t resist adding unnecessary apostrophes when they see last names. Watch out for apostrophe abuse when spreading holiday cheer, talking about friends, or shopping for home decor. They should only be used to show possession.

Festive Greetings from the Smith’s

You may have sent or received cards with a message like this. However, it’s incorrect because there’s nothing possessive about this phrase.

Festive Greetings from the Smiths

If you can’t resist the urge to add an apostrophe to your surname, make sure it shows possession.

Happy Holidays from the Smith’s Cute Kitties

Happy Halloween from the Rodriguez Family’s Lovable Pups
Please join us at the Johnson’s home for a pool party.

Watch out for welcome-mat woes that stem from incorrect punctuation, too. Your doormat shouldn’t say “The Lennon’s,” and neither should the side of your mailbox.

Two pink square characters labeled with s's illustrate that you don't need to add an extra s after an apostrophe for nouns ending in 's' like twins. The Text on the image reads: Apostrophe After S
Plural nouns, such as “twins” and “teachers,” usually don’t need an extra ‘s’

When Names Ending With ‘s’ Need an Apostrophe

The Lennons are hosting a party, and they want to invite their friends.

The Lennon’s welcome you to a fun-filled event.

The Lennons are hosting the party, not the Lennon’s or the Lennon family. Your invite should just have an ‘s’ after your surname, not an apostrophe. You don’t need an apostrophe because the last name is not expressing ownership.

The Lennons welcome you to a fun-filled event.

When the last name already has an ‘s’, such as Morales or Jones, possession punctuation gets confusing. Some people argue that you should add an extra ‘s’ when the surname becomes possessive.

Adding an extra ‘s’ is often considered redundant in this situation. Instead of declaring you loved the Jones’s chocolate chip cookies, you could say:

  1. The Jones’ treats were tasty.
  2. I liked the cookies the Jones family made.

Is “Its” Possessive? What About “Whose”?

An apostrophe usually makes a word possessive, but its and it’s are exceptions to this rule.

For showing possession: It’s, who’s
For Showing Possession: Its, whose

Apostrophe Exception #1: Its

When you want to make the word it possessive, write its, not it’s. It’s is a contraction for it is.

Apostrophe Exception #2: Whose

Another exception that causes confusion for similar reasons is whose and who’s.

  • Whose is a possessive that doesn’t use a contraction.
  • Who’s is the contraction for who is.

2. Apostrophes and Contractions

A contraction is a combination of multiple words or word groups. Instead of saying or spelling each word separately, a contraction is a way to merge several words together. This tool helps make language more efficient and concise.

Contractions and apostrophes are best friends. An apostrophe substitutes the missing letters and spaces in a contraction.

To illustrate how apostrophes help from contractions, a pink character shaped like an apostrophe is throwing out the 'o' in DO NOT  and taking its place.
We use an apostrophe to merge multiple words to create a contraction.

When you connect two words, an apostrophe is a grammatical glue that holds them together. This missing letter, or letters, is called an omission.

Examples of Common Contractions:

  • Do not” becomes “don’t
  • Cannot” becomes “can’t
  • I will” becomes “I’ll
  • Will not” becomes “won’t
  • You are” becomes “you’re” (but “your” never gets an apostrophe)

However, contractions are usually more informal writing and speech. For example, you typically see them during casual conversations or informal writing assignments.

Apostrophes also make an appearance in informal contractions such as ain’t. This popular slang word means are not, am not, or is not.

For more formal writing, avoid contractions.

When Decades Become Contractions

Just like we use apostrophes to shorten some words, we can also use them to shorten years (but not turn back the clock, unfortunately).

When formally writing a given year, we typically use four numbers. Take 1989 for example.

  • The first two numbers stand for the century.
  • The third number stands for the decade.
  • Finally, the last number expresses a specific year within the decade.

In the same way that can’t is a more informal way to say cannot, we can use apostrophes to informally express decades.

For example, the 1960s becomes the ’60s.

You’re a millennial if you were born sometime between the early ’80s and mid-’90s. You can also describe this range as the early 1980s to the mid-1990s. [graybox]

To shorten decades, just replace the century with a contraction.

However, during the ’60s and ’70s, many students learned to add apostrophes at the end of plural dates. For instance, the 1950’s or 1980’s. While some writers still take this approach, it’s not grammatically correct today.

Three decades are pictured on a a dark background. On the far left, '70s appears in pink with flower-power stickers, in the middle appears '80s with characteristic Memphis Design details, and '90s appears in yellow on the right.
Adding apostrophe s at the end of plural dates is grammatically incorrect.

Therefore, you should also avoid adding an apostrophe before the ‘s’ in shortened decades.

[example]Millennials grew up in the ’90s, not the 90’s.[/example] [example]Big hair was popular in the ’80s, not the 80’s.[/example]

What About Apostrophes and Holidays?

Things get tricky when referencing specific holidays rather than date ranges.

[graybox]Holidays and Apostrophes:

  • Mother’s Day has an apostrophe before the ‘s’ even though it’s a holiday for every mother, not just one.
  • Similarly, Valentine’s Day has an apostrophe before the ‘s’ even though it’s for multiple valentines around the world.
  • International Women’s Day takes the same approach.
  • April Fools’ Day takes a different approach and has an apostrophe after the ‘s’.
  • Veterans Day doesn’t have an apostrophe anywhere.

3. Apostrophes and Plural Letters, Numbers, and Symbols

Apostrophes are usually reserved for singular form possessives, but some plurals benefit from punctuation. This occurs when you need to make letters, numbers, or symbols plural.

This is because omitting an apostrophe in these cases might confuse readers.

For example, “Ryder is still learning to capitalize p’s and c’s” is less confusing when apostrophes are inserted.

How many s’s does Mississippi have?
When you arrive at the gate, make sure you enter three #’s followed by 482 to open it.

If its Just Plural, You Usually Don’t Need An Apostrophe

Many grammar experts cringe when they see grocery store ads littered with excess apostrophes. Dubbed the grocer’s apostrophe, this grammatical issue occurs when unnecessary apostrophes are added before the letter ‘s’.

  • apple’s
  • banana’s
  • cookie’s
  • deli meat’s
  • juice’s

Your grocer has apples on sale, not apple’s.

Likewise, you put on your shoes for work, not your shoe’s.

Your boss needs your expense sheets, not your expense sheet’s or sheets’.

You hate red lights, not red light’s, because they make you late for work.

An original infographic outlining apostrophe rules.
Your quick apostrophe rules cheat sheet.

Put Your Skills to the Test

Apostrophe Rules Question #1

complete the sentence
Correct! Oops! That's incorrect.

The answer is C. An apostrophe can replace the omission in a contraction. In this sentence, the apostrophe is replacing the missing letter "a" in "are."

Apostrophe Rules Question #2

Adding apostrophe +s at the end of plural dates — for example, the 1980’s — is grammatically correct.
Correct! Oops! That's incorrect.

The answer is FALSE. It's grammatically incorrect to add apostrophe +s at the end of plural dates.

Apostrophe Rules Question #3

complete the sentence
Correct! Oops! That's incorrect.

The answer is A. Since there’s no contraction or possession, you don’t need to add an apostrophe before or after the letter "s" in "apples."

Apostrophe Rules Question #4

which sentence is correct
Correct! Oops! That's incorrect.

The answer is B. "It’s" here serves as a contraction for "It is," with the apostrophe replacing the omission.

Apostrophe Rules Question #5

which sentence is correct

Please select 2 correct answers

Correct! Oops! That's incorrect.

The answers are A and D. Both are acceptable forms for making the proper noun, James, possessive.

Apostrophe Rules Question #6

You can use Whose and Who’s interchangeably in a sentence.
Correct! Oops! That's incorrect.

The answer is FALSE. "Whose" is a possessive that doesn’t need a contraction. On the other hand, "who’s" is the contraction for "who is."

Read More: Who Or Whom?

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Krista heads up Marketing and Content Creation here at INK. From Linguistics and History to puns and memes, she's interested in the systems we create to share our ideas with each other.

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    Mary Ann Bittle July 24 at 4:05 am GMT

    I completely disagree with the “correct” answer to #5! Why would anyone add yet another s when there is already an s there? Besides, that’s how I was taught to do it, back in the ’70s and ’80s, and it always has seemed to be the most LOGICAL way of doing things! James’ dog makes much better sense than James’s dog! Way too clunky with that extra s!

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      Krista Grace Morris Author July 29 at 5:50 am GMT

      Mary, thank you for taking our quiz and for your spot-on feedback! You are right in that s’ is an acceptable form (and way cleaner). We wrote the quiz this way because most academic style guides recommend the s’s format. BUT: we love how clear your answer is and like it so much more! We updated the quiz to reflect your point: both are correct. We created these quizzes for you, so please keep taking them and giving us your feedback. We want to improve in any way we can and make our content the best it can be. We’d love your opinion on this one, what do you think? https://blog.inkforall.com/adjectives

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