We use possessive forms to show who owns something.
We use the possessive 's to make a possessive noun.
We use a possessive pronoun to replace a possessive noun.
We use a possessive determiner (or possessive adjective) with a noun to tell us who owns the noun we are talking about.
Using Possessive 's With Time Phrases
We can use the possessive 's with time phrases to show that something belongs to, or is associated with, a certain period of time.