An old man with a suitcase walking across a street.
An old man is throwing rocks at trains
Either a old man is throwing rocks or walking.
exists s1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & across(x2,x4) & n_street(x4) & n_walking(x2) & of(x2,x3) & n_suitcase(x3) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(at(e1,x3) & n_train(x3) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_rock(x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))