When we want to show that something belongs to somebody or something, we usually add ’s to a singular noun and an apostrophe ‘ to a plural noun, for example:
the boy’s ball (one boy)
the boys’ ball (two or more boys)
Notice that the number of balls does not matter. The structure is influenced by the possessor and not the possessed.
one ball
more than one ball
one boy
the boy’s ball
the boy’s balls
more than one boy
the boys’ ball
the boys’ balls
The structure can be used for a whole phrase:
the man next door’s mother (the mother of the man next door)
the Queen of England’s poodles (the poodles of the Queen of England)
Although we can use of to show possession, it is more usual to use possessive ’s. The following phrases have the same meaning, but #2 is more usual and natural:
the boyfriend of my sister
my sister’s boyfriend
Proper Nouns (Names)
We very often use possessive ’s with names:
This is Mary’s car.
Where is Ram’s telephone?
Who took Anthony’s pen?
I like Tara’s hair.
When a name ends in s, we usually treat it like any other singular noun, and add ’s:
This is Charles’s chair.
But it is possible (especially with older, classical names) to just add the apostrophe ‘:
Who was Jesus’ father?
Irregular Plurals
Some nouns have irregular plural forms without s (man > men). To show possession, we usually add ’s to the plural form of these nouns:
singular noun
plural noun
my child’s dog
my children’s dog
the man’s work
the men’s work
the mouse’s cage
the mice’s cage
a person’s clothes
people’s clothes
POSSESSIVE
The general rules concerning the possessive form of words, abbreviations, and phrases appear below. For exceptions and rules applicable to specialized cases, such as biblical names, consult an English grammar text.
Common Nouns
Create the possessive form of a singular or plural noun, which does not end in s, by adding an apostrophe and an s.
the child’s ball
the people’s choice
the car’s color
the books’ covers
In instances involving compound nouns, the ’s is added to the element nearest to that which is possessed.
the auditor general’s report
the attorney at law’s address
In instances of joint possession, placing the apostrophe on the last element of a series.
Barton & Henderson’s store
Eisenhower and Nixon’s administration
However, in instances of individual or alternative possession, use an apostrophe for each element of the series.
men’s and women’s clothing
bachelor’s and master’s degrees
New York’s or New Jersey’s governor
Create the possessive form of a singular or plural noun, which ends with an s sound, by adding only an apostrophe.
the players’ equipment
Tom Jones’ television special
the cars’ tires
the man’s coat
Proper Names
Create the possessive form of a proper noun in the same manner as for a common noun. For singular proper names, add ’s. For plural names, and some singular names, which end in an s, add only an apostrophe.
Canada’s resources
United States’ budget deficit
New Orleans’ restaurants
the Whites’ cottage
Jones’ skates
Dickens’ writings
Create the possessive form of a name, which ends in a silent s, z, or x, by adding ’s.
Perez’s turn at bat
Des Moines’s airport
Guy Marcoux’s reputation
Abbreviations
Create the possessive form of an abbreviation in the same manner as you would for a word or term that was spelled out completely. Add ’s for the singular possessive or an apostrophe only for the plural possessive.
the IRS’s district offices
AT&T’s 1-800-telephone number
NBC’s newscast
IBM Corp.’s district sales office
Numerals
Create the possessive form of a noun that is composed of numerals in the same manner as you would for other nouns. Add ’s for the singular possessive or an apostrophe only for the plural possessive.
1995’s convocation ceremony
the 1930s’ economic reversals
Phrases
Create the possessive form of a phrase by adding an ’s or apostrophe to the last word of the phrase.
his brother-in-law’s house
board of trustees’ meeting
a month or two’s work
Indefinite Pronouns
Create the possessive form of indefinite pronouns by adding ’s.
one’s rights
anyone’s decision
someone’s hat
somebody’s purse
everybody’s efforts
somebody else’s problem
each other’s gifts
either’s choice
For some indefinite pronouns, it is preferable to indicate possession by using an “of” phrase.