A man doing a skateboard trick on a skateboard ramp
The man is riding a skateboard.
Doing a skateboard trick and riding could mean the same thing.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x5) & n_ramp(x5) & of(x5,x6) & n_skateboard(x6) & n_trick(x3) & of(x3,x4) & n_skateboard(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2))