Exclusive form of grammar is used to refer to a specific object only.

The security team is guarding the bank all night.

She had her menarche yesterday.

The police officer used a nightstick to restrain the criminal.

He is a keyboard warrior, he's not actually that strong.

He used clay to make a new mold.

He put up a notice on the bulletin board.

He raised the flag.

Kei is my best friend.

The katsura is my favorite tree.