The possessive case of a noun is used to show ownership or possession. Forming the possessive case of a noun can be done by adding an apostrophe and/or letter s depending on the rule where it falls.
1) Possessive case of a singular noun that does not end in s is formed by adding an apostrophe and s:
Examples:
The teacher’s pen is missing.
One of Italy’s best is pizza.
My favorite color is same as Ana’s.
2) Possessive case of a singular noun that ends in s is formed by adding an apostrophe and s, or an apostrophe only:
Examples:
Kris’s new bag is expensive. (or Kris’ new bag)
The bus’s tires are flat. (or bus’ tires)
Dolores’s class is Biology. (or Dolores’ class)
3) Possessive case of a plural noun that does not end in s is formed by adding an apostrophe and s:
Examples:
The children’s favorite food is spaghetti.
The men’s basketball team is ready.
People’s choice is you.
4) Possessive case of a plural noun that ends in s is formed by adding an apostrophe only:
Examples:
The boys’ average is slightly higher that the girls’.
The managers’ meeting is cancelled.
The doctors’ symposium is on Friday.
5) Possessive case of multiple nouns showing individual possession is formed by adding an apostrophe and s to each possessing noun:
Examples:
John’s, Ben’s and Kaye’s artworks are equally beautiful.
6) Possessive case of multiple nouns showing joint possession is formed by adding an apostrophe and s to the last possessing noun:
Examples:
Ken and Mary’s joint savings account is with a rural bank.
