Possessives with of
We cannot put a possessive between a noun and a determiner. We can say my friend, his friend, John's friend, a friend or that friend. But we can't say a my friend or that John's friend. Instead we use a structure with of + possessive.
Structure: determiner + noun + of + possessive
- He is a friend of mine.
- How is that brother of yours?
- He is a friend of my father's.
- He is a cousin of John's.
- Have you heard this new idea of the boss's?
Note that sometimes we use a noun without the possessive 's after of.
- He is a friend of my father.
- He is a cousin of John.
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