Here are some examples:
* Singular nouns:
* The dog's bone.
* The teacher's desk.
* John's car.
* Plural nouns ending in 's':
* The students' books.
* The birds' nests.
* Plural nouns not ending in 's':
* The children's toys.
* The women's shoes.
Other ways to show the genitive case:
* Of: This is used for inanimate objects and sometimes for people when referring to a part of something.
* The roof of the house.
* The edge of the cliff.
* The death of the king.
* Special phrases: These are often idiomatic and use prepositions like "for" or "of".
* A friend of mine.
* A cup of coffee.
Important notes:
* The genitive case can sometimes be ambiguous when used with plural nouns ending in 's'. For example, "the students' books" could refer to the books belonging to all the students or just one student.
* The possessive form ('s) can be used with some proper nouns that are already plural, like "the Joneses' house".
Overall, the use of 's is the most common way to show the genitive case in modern English, but other methods exist, depending on the context and the type of noun involved.