Some people in shadow walk by an escalator.
Some people are walking.
People in shadow are walking.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Actor(e1,x4) & n_escalator(x4) & Theme(e1,x3) & v_walk(e1) & (x1 = x3) & in(x1,x2) & n_shadow(x2) & n_people(x1))
exists e1 x1.(Actor(e1,x1) & v_walk(e1) & n_people(x1))