We use name + ’s for the possessive: Kate is Lisa’s sister.
NOT Kate is the sister of Lisa.
TIPS!
• For plural nouns, the apostrophe ( ’ ) is after the s:
My parents’ names are Pat and Bill.
• ’s can mean the possessive, is or has:
Bill is Lisa’s father. (’s = possessive)
Kate’s her sister. (’s = is)
She’s got a brother. (’s = has)
• We use whose to ask which person/people a thing belongs to:
Whose mobile phone is that? It’s Tom’s.
