Water changes into vapor when it is heated.

Convulsions can occur when they run a fever.

That was when I started going to the pool for exercise.

The dog started to yelp when it saw the mailman.

They'd already left when I arrived.

The phone vibrates when I receive a message.

She wept when she heard the news.

Reliability is an important factor when choosing a car.

When the sun sets, the sky turns red.

He hurt himself when he fell.