A young skateboarder on a ramp.
A young person is skateboarding.
A skateboarder is a person, and if the skateboarder is on a ramp, they are skateboarding.
exists s1 x1 x2.(a_topic(x1) & on(x1,x2) & n_ramp(x2) & n_skateboarder(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1.(Actor(e1,x1) & v_skateboard(e1) & n_person(x1) & a_young(s1) & Theme(s1,x1))