A skater rides his board on a ramp .
A girl drives a jetski around the lake .
A skater rides his board on a ramp.
A girl drives a jetski around the lake.
"His" implies that the skater is not a girl. A Jetski and a board are separate methods of transportation.
`` His '' implies that the skater is not a girl . A Jetski and a board are separate methods of transportation .