The police are looking for an eyewitness to the incident.

The seismologist is studying earthquake prediction and disaster prevention.

He was an eyewitness to the incident.

The freight train passed through the station.

Sextans is one of the constellations in the southern sky.

He built a reputation in the world of politics.

The glass is transparent, and you can clearly see the scenery outside.

Her life always encourages people.

His life is very monotonous.

He has already finished writing the report, so we use the present perfect form.