Possessive forms express the idea of "having" which exists between two nouns.

APOSTROPHE S

1. We normaly use a possessive (+ 's) when something belongs to a particular person or thing.

- a person
- an animal
- an organization
- a group of people
- or a place

• With places we can also say

- Sarongis one of the most famous restaurants in Bali

2. If a name (or singular noun) finishes in s, we either add 's, Chri's book, or put an apostrophe at the end of the word, Chris' book. 
With irregular plurals which dont end in s (people, children, men, etc.) we add 's

• If there are two people, we add the 's to the second name.

3. When 's refers to "the house of" or "the store of", we often omit the word house or store.

USIING OF  (instead of apostrophe s)

1. We normally use an of phrase, not 's, with thongs or abstract nouns, especially when one thing is part of another.

2. We use of  to express possession with a long phrase, 

3. With friend, we often say a friend of + name / noun +  's. 

COMPOUND NOUNS

1. We use compound nouns, not possessive forms, to refer to people or things in terms of what they are for, what they are made of, what work they do, or what kind they are. 

The second noun is the main thing or person, and can be singular or plural. The forst noun gives more information about the second noun. It is inusually singular, unless it has no singular from

Compound nouns are usually two separate words, but they are occasionally joined together as one word.

2. With containers, a compound noun (a milk bottle) focuses on the container (usually empty), whereas the container + a possessive noun (a bottle of milk) focuses on the contents ( the contaner is usually full).