A man on rollerblades is doing a trick.
The man is riding a skateboard in a skatepark.
The man cannot be wearing rollerblades and riding a skateboard at the same time.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & on(x1,x2) & n_rollerblade(x2) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & in(e1,x3) & n_skatepark(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2))