1. The sun is behind the clouds today.

clouds
 2. This boy is hiding behind a tree.
boy
 3. He doesn’t like to work behind a desk.
behind a desk

 4. There are thousands of office workers behind the glass and steel of this skyscraper.

hong kong
 5. Behind the horse, there’s a man in a carriage.
behind

6. There are five hikers walking behind a tour guide.

people hking
 7. She’s falling behind at work, so now she takes her work home and finishes it on the weekend.
behind at work

 8. He looks so sad behind those metal bars!

dog between two people

 9. It’s a good idea to pay attention to the road when you’re behind the wheel of a car.

(behind the wheel = driving)

driving

 10. This horse is kept behind a fence; otherwise, he might run away.

(You can also say, “kept inside a fence”)

horse