Here are useful rules for the apostrophe. Learn them well, and use them in your writing.
- Use an apostrophe to form the possessive of singular and plural nouns.
Add an apostrophe and an s to form the possessive of a singular noun.
flag + 's = flag's colors
glass + 's = glass's cost
Note: If a plural noun ends in s, just add an apostrophe.
cars + ' = cars' interiors
televisions + ' = televisions' locations
Note: If a plural noun does not end in s, add 's to the word.
women + 's = women's department
Note: If a name of two or more syllables ends in an eez sound, the possessive is formed without an additional s.
the tales of Ulysses = Ulysses' tales
the speeches of Orestes = Orestes' speeches
- To make the possessive of a compound word or the name of a co-owned business or organization, add 's to the last word of the name.
Jackson and Meyer's law firm
Activity 1
Make each phrase possessive. Write your answer on the line provided.
- __________ the pictures owned by Mary
- __________ the coat owned by the sister-in-law of John
- __________ the speech delivered by Les
- __________ the space owned by Fred and Garrett
- __________ the address of Demetrius
Here are more situations involving the use of the apostrophe. Review them, and incorporate them into your writing.
- Use an apostrophe in contractions (words that combine two words into one).

- Form the plural of a lowercase letter by placing an 's after the letter.
There are three a's in that word.
You do not have to add an apostrophe to form the plural of capitalized letters, numbers, or symbols.
We counted three Ts in that paragraph. (capitalized letters)
How many 8s (or eights) are in that column? (numbers)
Earl loves to use $s (or dollar signs) in his writing. (symbols)
- Use an apostrophe to show where the letter(s) is left out in a word or number.
The Class of '18 = The Class of 2018
Gregory's = Gregory is or Gregory has
- Use an apostrophe to form the plural of an abbreviation that ends with a period.
B.A.'s (or BAs) = Bachelors of Arts
M.A.'s (or MAs) = Masters of Arts
PhD.'s (or PhDs) = Doctors of Philosophy
P.A.'s (or PAs) = Physicians Assistants
- Use an apostrophe to form the plural of an abbreviation that is not followed by a period. It is also acceptable to write the plural without the period.
How many CD's (or CDs) do you own?
How many different LSAT's (or LSATs) has Bertha taken?
Activity 2
On the line next to each number, form the possessive form of the person, place, or thing using an apostrophe.
- ____ the scarf that belongs to the woman
- ____ the scarf that belongs to Helen
- ____ the scarves that belong to the women
- ____ the bike that is owned by the boy
- ____ the bike that is owned by Chris
- ____ the bikes that are owned by the boys
- ____ the room occupied by the baby
- ____ the room occupied by the babies
- ____ the opinions of everybody
- ____ the ideas of my uncle
- ____ the backpack belonging to someone
- ____ the home of my brother-in-law
- ____ the car owned by Jim and Nicole
- ____ the cars separately owned by Nicole and Jim
- ____ the magazine of this month
Answers
Activity 1
- Mary's pictures
- John's sister-in-law's coat
- Les's speech
- Fred and Garrett's space
- Demetrius' address
Activity 2
- the woman's scarf
- Helen's scarf
- the women's scarves
- the boy's bike
- Chris's bike
- the boys' bikes
- the baby's room
- the babies' room
- everybody's opinions
- my uncle's ideas
- someone's backpack
- my brother-in-law's home
- Jim and Nicole's car
- Nicole's and Jim's cars
- this month's magazine
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From The Grammar Teacher's Activity-a-Day. Copyright © 2010 by Johh Wiley & Sons, Inc. All Rights Reserved.