Read the following sentences:

• have a complete thought

• The screams of the girl could be heard in the corridor.

• The friends of Jerry decided to go sailing.

These sentences show possession in a rather long way. Now, read the following:

• The girl's screams could be heard in the corridor.

• Jerry's friends decided to go sailing.

Girl's and Jerry's are possessive nouns. A possessive noun shows possession. It changes its form to show that it owns or is closely related to something else.