A person sitting down on a benching waiting in the subway.
Someone is standing in the walkway.
Someone cannot be sitting down and standing at the same time.
exists e2 e1 s1 x1 x2 x3 x4.(n_subway(x4) & a_topic(x1) & on(e1,x3) & in(x3,x4) & n_waiting(x3) & Actor(e2,x3) & v_bench(e2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(n_walkway(x2) & in(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_person(x1))