A boy on a skateboard is at the top of a ramp.
The boy is inside
The boy can't be on a skateboard at the top of a ramp because he is inside.
exists p1 x1 x2 x3.(n_top(x3) & exists x4.(at(x1,x3) & of(x3,x4) & n_ramp(x4)) & on(x1,x2) & n_skateboard(x2) & n_boy(x1))
exists e1 s1 x1.(n_boy(x1) & a_inside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_be(e1))