He is very popular at school.

You often see homeless people in that park.

Who is the owner of this house?

He is the main organizer of this event.

He is a very excellent technician.

He is a world-renowned researcher.

The operator is operating the machine.

He is already an adult, so he can make his own decisions.

The police are looking for an eyewitness to the incident.

The police arrested the suspect.