He was entrusted with the song selection for the party.

He is selecting music for the party.

The demarcation of this area is clearly defined.

We decided to demarcate this land.

It is important to learn the history of the World War.

We made a TV commercial to advertise our new product.

We have started advertising our new product.

He started reading self-help books to stop his habit of masturbation.

She beautifully played the trill on the flute.

This region has suffered from war for a long time.