old man pushing a cart in street.
The man pushes nothing.
The man could not be pushing a cart and pushing nothing.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_street(x4) & Theme(e1,x3) & Actor(e1,x2) & v_push(e1) & n_cart(x3) & (x1 = x2) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists x1.(n_man(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_push(e1) & n_thing(x2)))