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The words my, your, his, her, its, our, their are called possessive determiners.
Usethese words before nouns to say who something belongs to.


These are my shoes

That is our bird

You can take your guitar

The dentist asked his patient to open her mouth


Examples

Is this your house?
Robert, your handwriting is difficult to read.
Michael is showing his tortoise to his friends.
My sister lost her way in the city.
The lion is chasing its prey.

Possessive case

We use 's with one person or animal.
And ..
We use s' with more than one person or animal.


This is Bob's house

those are the boys' books

these are Ben's and Joe's bikes

It's Mona's new dress