What's this?
A keyboard.
Student: Is this my rubber?
Teacher: Yes it's...
yours
It's my dog. It's...
mine
What's this?
A harp.
Is that Tim and Nick's ruler? Yes it's...
theirs
This is the house where we live. It's...
ours
It's Mia's cat. It's...
hers
What's this?
a trombone
This Nintendo Switch is my brother's and mine. It's...
ours
Is this Sandra's pen? Yes it's...
hers
What's this?
A saxophone.
What's this?
A trumpet.