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Using Apostrophes
The Rules for Using Apostrophes
The apostrophe is only small, but it is a real grammar villain. It is responsible for lots of writing errors. In fact, of all the punctuation marks, the apostrophe is the one with most potential to damage your credibility because your readers will expect you to know how to use apostrophes.Apostrophes are used in four ways:
- to show possession (e.g., dog's dinner)
- in time expressions (e.g., 2 years' pay)
- in contractions (e.g., isn't)
- to show awkward plurals, but only very awkward plural (e.g., i's and a's)
Table of Contents
- Four Ways to Use Apostrophes
- Three Common Mistakes with Apostrophes
- Use of Apostrophes Explained in Detail
- (1) Using Apostrophes for Possession
- (2) Using Apostrophes in Time Expressions
- (3) Using Apostrophes to Replace Letters in Contractions
- (4) Using Apostrophes in Awkward Plurals
- Using Apostrophes Incorrectly with Plurals
- Video Lesson
- Video on Possessive Apostrophes (A Neat Trick)
- Printable Test

Four Ways to Use Apostrophes
We will cover all four uses of the apostrophe in detail later in the lesson. For now, here are more examples of the four ways to use apostrophes with a key observation for each one:(1) To show possession.
- a dog's kennel
- our boys' bedroom
- the children's toys

Amazing Tip! The letters before the apostrophe always spell the possessor perfectly. So, in the first example, the letters before the apostrophe spell "dog" (not "dogs"). In the second, they spell "boys" (not "boy"). In the third, they spell "children" (not "childrens"). Look again. The letters before the apostrophe always spell the possessor perfectly. This is a 100% rule. If you remember it, you can ignore the seemingly complicated rules that follow.
(2) To write time expressions.
- a day's pay
- two weeks' holiday
- one month's salary

Amazing Tip! The rule above works for time expressions too! The letters before the apostrophe always spell the unit of time perfectly.
(3) To replace letters in contractions.
- can't
- it's
- you're

Amazing Tip! Some writers confuse contractions with normal words (e.g., it's with its, you're with your). To prevent this error, expand the contraction to the full form (e.g., it is, you are). If your sentence no longer makes sense, then the word you expanded was not a contraction and should not contain an apostrophe. Simple.
(4) To show awkward plurals.
- Accommodation has two a's.
- Hawaii has two i's.
- There are three big if's.

Beware! Using an apostrophe for a plural is disliked by many writers, but it can be efficient. Showing an awkward plural with an apostrophe is condoned by all the leading grammar references.
Three Common Mistakes with Apostrophes
Apostrophes are responsible for some serious writing errors. Here are the three most common mistakes related to apostrophes:(1) To show normal plurals.
- three cat's
(should be "cats")
- good idea's
(should be "ideas")
- two video's
(should be "videos")
(2) Randomly before the letter "s."
- He like's pies.
(should be "likes")
- Jack agree's with you.
(should be "agrees")
- Time fly's like an arrow. Fruit fly's like a banana.
(should be "flies")
(3) Using a contraction incorrectly.
- She likes you're dress.
(should be "your")
- I can see it's tail.
(should be "its")
- They're parents live in Scotland.
(should be "their")
Use of Apostrophes Explained in Detail
This section explains when to use apostrophes in more detail and gives examples for each way apostrophes are used.(1) Using Apostrophes for Possession

- The dog's kennel
- The dogs' kennel
Does the apostrophe go before or after the "s"?
The big question is whether to put the apostrophe before the "s" or after the "s." The basic rules are as follows:- One dog's dinner
- One dog's dinners
- Two dogs' dinner
- Two dogs' dinners
An exception to the rule: plural words that don't end "s"
The most notable exception is when the plural doesn't end in "s" (e.g., "children," "women," "people," "men"). These words have the apostrophe before the "s" (even though they're plural). For example:- children's toys
- women's hat
- people's poet
- men's sizes
Another exception to the rule: singular words that end "s"
Another quirk is that singular nouns ending "s" (e.g., "Wales," "Moses," "John Wells") form their possessive forms either by adding ' (just an apostrophe) or 's depending on how you (personally) say the possessive form. For example:- John Wells' report
- John Wells's report
Are You Good at Possessive Apostrophes?
Here's a quick test.(2) Using Apostrophes in Time Expressions

The big question with these is where to put the apostrophe. The ruling is quite simple: the apostrophe goes before the "s" for a single unit of time (e.g., one day's pay) and after the "s" when it's more than one (e.g., two days' pay).
Examples:
- I never did a day's work in my life. It was all fun.
(Inventor Thomas Edison)
- It's not worth it for just two minutes' pleasure.
- I live a stone's throw away.
- a year's insurance
- two weeks' holiday
(3) Using Apostrophes to Replace Letters in Contractions

- When I was born I was so surprised I didn't talk for a year and a half.
(Comedian Gracie Allen)
- Life is something that happens when you can't get to sleep.
(Author Fran Lebowitz)
Read more on apostrophes replacing letters
(4) Using Apostrophes in Awkward Plurals

- There are two i's in skiing.
- You use too many but's in your writing.
- There are two Is in skiing.
- You use too many "but"s in your writing.
Using Apostrophes Incorrectly with Plurals

This mistake is most commonly seen when people form the plurals of nouns, but it happens with verbs too; e.g., He eat's pies.

Examples:
- I like pig's. Dog's look up to us. Cat's look down on us. Pig's treat us as equal's.
- I like pigs. Dogs look up to us. Cats look down on us. Pigs treat us as
equals. - A spoken word is not a sparrow. Once it fly's out, you cannot catch it.
- Tomato's and oregano make it Italian; wine and tarragon make it French; garlic makes it good.


Video on Possessive Apostrophes (A Neat Trick)
Here is a short video summarizing how to use possessive apostrophes:Are you a visual learner? Do you prefer video to text? Here is a list of all our grammar videos.
An Infographic Explaining the History
This infographic explains the history behind the possessive apostrophe. It really helps!Help Us Improve Grammar Monster
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