Apostrophes are used for two main purposes:
  • Possession
  • Contractions

CONTRACTIONS

The apostrophe is used to join two words together to
make one word.  

Example:
do not = don't

The apostrophe takes the place of the missing letter.  For
example, in "doesn't", the apostrophe takes the place of
the "o" that is gone.  

Here are some more examples of contractions:

have not = haven't
is not = isn't
I am = I'm

Although contractions are common in speaking and
informal writing, they should not be used in formal
writing.


POSSESSION

Apostrophes are used with nouns to show possession.  
Here are the rules on how to use them properly.

Single Nouns
•        Add apostrophe and "s"
                      The dog's bowl
                      The boy's hat

Plural Nouns
•        Add an apostrophe
                     The girls' toys
                      The computers' screens

Irregular Plural Nouns
•        Add an apostrophe and "s"
                      The children's toys
                      The women's hats

Nouns that end in "S"

Singular
•        Add an apostrophe and "s"
•                Charles Dickens's novel
•        Or, add only an apostrophe
•                Charles Dickens' novel
   
Plural
•        Add an apostrophe
•                The Davis' home
         (Tom and Mary Davis, 2 people)


More than 1 Noun
•        The apostrophe goes on the last name in a group
that shares possession.
                      Jon and Bob’s house
                      (They both possess the house)        
          
PLURAL ABBREVIATIONS
Do not use apostrophes for plural nouns that are
abbreviations or numbers.

Examples:        
DVDs, CDs, 1970s
Not, Cd's, 1970's
Learn English Pronunciation
 

Apostrophes

Practice apostrophes with this test:

  • Apostrophe Test