Possessive 's or Saxon Genitive

LOOK at these sentences:

Pam's hat.
My son's toys.
The dog's name is Lula.

We often use the saxon genitive  with people or animals. Although it is commonly used to show possession, it sometimes has other meanings.  EXAMPLES:

This is John's car (= this car belongs to John).
Where is the director's office? (= the office where the director works).

RULES:

• Write 's with a singular noun: My daughter's friends. 
• Write only ' with a plural noun ending in -s: My friends' house. 
• Write 's with a plural noun not ending in -s: The children's teacher. 

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