Where is the hospital? (across from)
It is across from the post office.
What's this place?
This is a park.
Where is the post office? (next to)
It's next to the library.
Where is he? (in front)
He is in front of the post office.
Where is she? (at)
She is at the movie theater.
What is this place?
This is a movie theater.
Where are they? (in)
They are in the library.
What is this place?
This is a library.
What is this place?
This is a supermarket.
What is this place?
This is a department store.
What is this place?
This is a post office?