sentence: The person holds a blade to sharpen it. sentence:   The person takes the belt off the machine. sentence:   The person puts a new belt on the machine. sentence:   The person sharpents the blade on the second belt. sentence:   The person takes the second belt off. sentence:   The person puts on a third belt. sentence:   The person sharpens the blade on the third belt. sentence:   The person demonstrates the blade's edge.