Are you uncertain about when to use an apostrophe? Many people have difficulty with this punctuation mark. The best way to get apostrophes right is to understand when and why they are used. There are three main cases—click on the links below to find straightforward guidance.
People are often unsure about whether they should use its (without an apostrophe) or it’s (with an apostrophe). For information about this, you can go straight to the section it's or its?
Apostrophes showing possession
You use an apostrophe to show that a thing or person belongs or relates to someone or something: instead of saying the party of Ben or the weather of yesterday, you can write Ben’s party and yesterday’s weather.
Here are the main guidelines for using apostrophes to show possession:
Singular nouns and most personal names
With a singular noun or most personal names: add an apostrophe plus s:
We met at Ben’s party.
The dog’s tail wagged rapidly.
Yesterday’s weather was dreadful.
Personal names that end in –s
With personal names that end in -s: add an apostrophe plus s when you would naturally pronounce an extra s if you said the word out loud:
Two of Ray Charles’s children were at the event.
Dickens's novels provide a wonderful insight into Victorian England.
Thomas's brother was injured in the accident.
Note that there are some exceptions to this rule, especially in names of places or organizations, for example:
St Thomas’ Hospital in London
If you aren’t sure about how to spell a name, look it up in an official place such as the organization’s website.
With personal names that end in -s but are not spoken with an extra s: just add an apostrophe after the -s:
The court dismissed Bridges' appeal.
Connors' finest performance was in 1991.
Plural nouns that end in –s
With a plural noun that already ends in -s: add an apostrophe after the s:
The mansion was converted into a girls’ school.
The work is due to start in two weeks’ time.
My duties included cleaning out the horses’ stables.
Plural nouns that do not end in -s
With a plural noun that doesn’t end in –s: add an apostrophe plus s:
The children’s father came to see me.
He employs 14 people at his men’s clothing store.
The only cases in which you do not need an apostrophe to show belonging is in the group of words called possessive pronouns - these are the words his, hers, ours, yours, theirs (meaning ‘belonging to him, her, us, you, or them’) - and with the possessive determiners. These are the words his, hers, its, our, your, their (meaning 'belonging to or associated with him, her, it, us, you, or them'). See also it's or its?
Apostrophes showing omission
An apostrophe can be used to show that letters or numbers have been omitted. Here are some examples of apostrophes that indicate missing letters:
I’m - short for I am
he’ll - short for he will
she’d – short for she had or she would
mix ’n’ match - short for mix and match
it’s hot - short for it is hot
didn’t - short for did not
It also shows that numbers have been omitted, especially in dates. For example: the Berlin Wall came down in the autumn of ’89 (short for 1989).
These two words can cause a lot of confusion: many people are uncertain about whether or not to use an apostrophe. These are the rules to remember:
its (without an apostrophe) means "belonging to it":
The dog wagged its tail.
Each case is judged on its own merits.
it’s (with an apostrophe) means "it is" or "it has":
It’s been a long day.
It’s cold outside.
It’s a comfortable car and it’s got some great gadgets.
Apostrophes showing certain plurals
In general, you should not use an apostrophe for ordinary plurals of nouns, abbreviations, or numerical dates. For example:
(e.g., The cost of the trip is 570 dollars.)
(e.g., Traditional Italian pizzas are thin and crisp.)
(e.g., She buys big bags of organic apples and carrots.)
(e.g., I hold two PhDs in evolutionary biology.)
(e.g., The situation was different in the 1990s.)
There are a very few cases in which it is acceptable to use an apostrophe to form a plural, purely for the sake of clarity:
you can use an apostrophe to show the plurals of single letters and numbers:
There are two p’s in appear.
Find all the number 7’s.
you can use an apostrophe to show the plurals of some very short words, especially when they end with a vowel:
He was taken aback when the no’s overwhelmed the yeses.
It's very important to remember, however, that in the vast majority of cases, an apostrophe should never be used to form plurals.
Back to Punctuation.
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