He falls down every time he tries to ride a bike.

He fell down while running.

He has fallen down the stairs.

She is falling down the stairs.

He is shutting down the computer.

He shuts down the computer every night.

He went down the khazi to use the bathroom.

The sun goes down in the evening.

My plans for the weekend went down the pan when it started raining.

He flushed his money down the toilet.