P5: Using Apostrophes


  1. Use apostrophes with nouns to show possession.
  2. Know when to use apostrophes to show possession in pronouns.
  3. Know how to use apostrophes to form contractions.

Apostrophes are a tool for making English more streamlined. Instead of saying, “the book that belongs to Elizabeth,” you can say, “Elizabeth’s book.” Instead of saying, “I cannot come,” you can say, “I can’t come.” Although you could avoid using apostrophes, your writing will be more natural if you learn the rules for using possessives and contractions appropriately. Some people also opt to use apostrophes to form plurals in certain situations, but many usage experts continue to warn against this practice.

The following video introduces you to some funny, yet common misuses of the apostrophe, and a song with a catchy chorus that is hard to forget: “Don’t put an apostrophe in i-t-s unless you mean it is!” (“Apostrophe Song” 00:22). https://youtu.be/Vc2aSz9Ficw “Apostrophe Song.” Created by Shaun McNicholas, published on 4 Aug. 2010. License: All Rights Reserved. License Terms: Standard YouTube License ©

“Apostrophe Song.” Created by Shaun McNicholas, published on 4 Aug. 2010. License: All Rights Reserved. License Terms: Standard YouTube License ©

Using Apostrophes with Nouns to Show Possession

You form a possessive when you want to show a noun or pronoun in a sentence has ownership of another noun or pronoun.

Standard Singular and Plural Nouns

As shown in the following table, most nouns follow standard patterns for forming plurals.



Example 1

Example 2

Singular noun

Add apostrophe + –s.

dog’s collar

class’s assignment

Plural noun ending in s

Add only an apostrophe.

dogs’ collars

classes’ assignments

Plural noun ending in any letter other than s

Add apostrophe + –s.

people’s plans

women’s plans

Proper nouns

Follow the regular noun rules.

Finches’ family home

Atticus’s glasses

Business names

Use the format the company has chosen whether or not it matches possessive formation guidelines.

McDonald’s employees

Starbucks stores

Compound Nouns

When forming the possessive of a compound noun, form the possession only on the last word. Use standard guidelines for that word.

  • sister-in-laws hair
  • six-year-olds growth patterns
  • wallpapers patterns
  • courthouses aura

Two or More Nouns

When two or more nouns both possess another noun, form the possession only with the second noun if you are noting joint ownership. Form a possession on both nouns if each possession is independent.

  • Jem and Scouts escapades (the joint escapades of the two children)
  • Jems and Scouts escapades (the separate escapades of the two children)

Understanding Apostrophes and Possessive Pronouns

Possessive pronouns (his, her, hers, its, my, mine, our, ours, their, theirs, your, yours) show possession without an apostrophe.

  • Is this hat yours?
  • Those are his shoes.
  • The dress is hers.

Indefinite pronouns (another, anybody, anyone, anything, each, everybody, everyone, everything,nobody, no one, nothing, one, other, others, somebody, someone, something) require an apostrophe to show possession.

  • anothers problem
  • everyones problems

Using Apostrophes to Form Contractions

Contractions are shortened versions of two or more words where an apostrophe marks the missing letters. English has a wide range of common contractions, including those in the following table.

Words in Contraction


Words in Contraction


I am


what will


we are


they will


what is


what has


can not


should not


does not


do not


In addition to the many standard contractions, people often create custom, informal, on-the-spot contractions. Generally speaking, these informal uses of apostrophes can be omitted from college and workplace writing.

Example: My husbands (husband is) also coming.

As a reader, you have to use context to know if the use of “husband’s” is possessive or a contraction since the two are visually the same.

  • My husbands also coming.
  • My husbands watch is on the table.

Using Apostrophes to Form Plurals

Some people choose to form plurals of individual letters, numbers, and words referred to as terms. Many usage experts frown on this practice and instead choose to form the plurals by simply adding an –s. Here are some examples of the two options, as well as methods of avoiding having to choose either option.


  • Situation: more than one of the letter t
    • Plurals using apostrophes: There are two t’s in Atticus.
    • Plurals without using apostrophes: There are two ts in Atticus.
    • Avoiding the choice: The letter t shows up in Atticus twice.
  • Situation: more than one of the number 5
    • Plurals using apostrophes: If I remember right, the address has three 5’s in it.
    • Plurals without using apostrophes: If I remember right, the address has three 5s in it.
    • Avoiding the choice: If I remember right, the number 5 shows up three times in the address.
  • Situation: more than one “there” in a sentence
    • Plurals using apostrophes: This sentence has five there’s.
    • Plurals without using apostrophes: This sentence has five theres.
    • Avoiding the choice: The word “there” is used five times in this sentence.

The following video from Khan Academy has an in-depth introduction to the uses of apostrophes:

Introduction to the Apostrophe.” Published by Khan Academy.

Adapted from Chapter 18 “Punctuation” in Writer’s Handbook v 1.0 , used according to Creative Commons CC BY-NC-SA 3.0

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