Young people sitting on steps.
People sit on steps.
If people sit then they are sitting
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_step(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_step(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))