The days of our youth are now far behind.

The cat is hiding behind the couch.

He fell on his behind and hurt himself.

We worked behind the scenes to make this happen.

Don't leave your belongings behind when you leave.

I always seem to run behind schedule.

Despite his efforts, he was lagging behind his classmates in math.

If you don't study hard, you will fall behind in class.

The prisoner was behind bars for two months.

Although his experience is vast, his ideas on management are behind the times.