The possessive case shows ownership. With the addition of ’s (or sometimes just the apostrophe), a noun can change from a simple person, place, or thing to a person, place, or thing that owns something. There are a few different ways to form the possessive of a noun. We’ll discuss these ways below.
If the noun doesn’t end with an s, add ’s to the end of the noun. See the following examples:
If the noun ends with an s, add just the apostrophe to the end of the noun. See the examples below for an illustration of this type of possessive noun.
If you have a compound noun (for example, when you’re talking about two people who jointly own one thing), change only the last noun to the possessive. The examples below illustrate this usage of the possessive case.
If the possessor is a building, an object, or a piece of furniture, you don’t need to add an apostrophe to show possession. See the examples below for reference: