A man performing an ollie on a skateboard.
Nobody has a skateboard.
Nobody cannot have a skateboard if a man is performing an ollie with a skatebord.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_skateboard(x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_ollie(x3) & (x1 = x2) & n_man(x1))
-exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_skateboard(x2) & n_person(x1))