A guy in a white shirt skateboarding on a ramp.
There is a man doing a trick in the air.
Skateboarding on a ramp doesn't imply doing a trick in the air.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & on(e1,x4) & n_ramp(x4) & Actor(e1,x3) & v_skateboard(e1) & (x2 = x3) & n_shirt(x2) & a_white(s1) & Theme(s1,x2) & n_guy(x1))
exists p1 x1 x5.(n_air(x5) & exists e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & in(x4,x5) & n_trick(x4) & (x2 = x3) & n_man(x2)))