Label the prepositional phrase as an Adjective or an Adverb phrase. A football player's training begins at an early age. Athletes must practice for hours. Great athletes need a great deal of patience and dedication. Injuries to the ankles are common.
Some athletes retire because of their injuries.
The boy lost his dog behind the big tree. In the corner of the room John sits. They often work on large benches. Pictures with complex patterns fill the hallway. I ran behind the fence to get my arrow.