Who's he?
He's a waiter.
Who's she?
She's a waitress.
Who's she?
She's a customer.
What's it?
It's an uniform.
What's it?
It's a bottle of water.
What's it?
It's a cup of coffee.
What's it?
It's a glass of milk.
What's it?
It's a bowl of soup.
What's it?
It's a plate of salad.
What's it?
It's a menu.
