Where are you?
I'm at the library.
What are you doing at the post office?
I'm mailing letters.
What are you doing at the library?
I'm borrowing books.
Where are you?
I'm at the movie theatre.
Where are you?
I'm at the supermarket.
What are you doing at the park?
I'm kicking a ball.
Where are you doing at the movie theatre?
I'm watching a movie.
Where are you?
I'm at the park.
Where are you?
I'm at the department store.
Where are you doing at the department store?
I'm shopping.
Where are you?
I'm at the post office.
What are you doing at the supermarket?
I'm buying groceries.