A child performs skateboard tricks on a wooden platform.
The boy flies a plane.
One cannot perform skateboard tricks and fly a plane at the same time.
exists e1 s1 x1 x2 x3 x4.(on(e1,x4) & n_platform(x4) & a_wooden(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & of(x2,x3) & n_skateboard(x3) & n_child(x1))
exists e1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_plane(x2))