That person speaks in a dialect that is not common.

He is practicing every day to completely become an actor.

We should do our best to solve the urgent problem.

We should tackle this issue as a matter of urgency.

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.