4. Possessive

The possessive indicates who or what a thing belongs to or that it is a part of something. For example, the teacher’s desk is a desk that belongs to the teacher. There are two ways to express owning and belonging in English: the suffix -‘s and the word of. The -‘s suffix is often used when something is owned by a person: 

the teacher’s desk
a famous actor’s house
somebody’s jacket

The of sentence structure is often used when saying that places or things belong together: 

the streets of London
the door of the bedroom