A person is doing a jump with a skateboard on a ramp.
The person on the skateboard ramp is an expert at dangerous skateboard stunts
Just because a skateboarder is doing a jump off of a ramp, doesn't mean they are an expert at dangerous skateboard stunts.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x4) & n_ramp(x4) & with(x2,x3) & n_skateboard(x3) & n_jump(x2) & n_person(x1))
exists p1 x1 x2 x3.(n_ramp(x2) & of(x2,x3) & n_skateboard(x3) & n_person(x1) & exists s1 x4 x5 x6.((x1 = x4) & at(x4,x5) & n_stunt(x5) & of(x5,x6) & n_skateboard(x6) & a_dangerous(s1) & Theme(s1,x5) & n_expert(x4)) & on(x1,x2))