Here's how to identify a possessive noun:
* It usually ends in an apostrophe followed by an "s" ('s). For example: "The dog's bone" or "John's car."
* If the noun is plural and already ends in an "s", you just add an apostrophe. For example: "The cats' food" or "The students' homework."
Examples of possessive nouns:
* The boy's toys are in the box.
* The bird's nest is in the tree.
* My sister's car is red.
* The teachers' meeting is tomorrow.
* The company's profits are up this year.
Note:
* Possessive nouns are often used with other nouns, forming noun phrases.
* Don't confuse possessive nouns with plural nouns, which simply indicate more than one of something.
Let me know if you'd like more examples or have any further questions!