This is a genuine diamond.

His actions show genuine friendship.

She is receiving acupuncture treatment using gold needles.

The coastline has changed shape due to years of erosion.

The coastline is gradually changing its shape due to the erosion by waves.

He is proud to be a subject of the emperor.

The astronomers began observing the nova.

This experiment is conducted in a vacuum.

I went to the department store to buy new bedding.

The city becomes quiet when it's midnight.