I sent a postcard to my friend.

Could you tell me your postal code?

I sent you a postcard.

I sent important documents by registered mail.

There is not a single letter in my mailbox.

Please put the letter in the post office box.

I posted a letter in the mailbox.

My father works at a local broadcasting station.

I played a game of checkers with him.

It's a five-minute walk from my house to the fire department.