A person riding a white horse on a cobble street.
A person is driving
A person can't be on a horse and driving at the same time.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_street(x4) & a_cobble(s2) & Theme(s2,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_horse(x3) & a_white(s1) & Theme(s1,x3) & (x1 = x2) & n_person(x1))
exists e1 x1.(Actor(e1,x1) & v_drive(e1) & n_person(x1))