A man surrounded by others in a subway train.
The man is alone on the train.
The man is either alone or surrounded by others.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x4) & n_train(x4) & of(x4,x5) & n_subway(x5) & Actor(e1,x3) & -(x3 = x1) & n_person(x1) & n_person(x3) & Theme(e1,x2) & v_surround(e1) & (x1 = x2) & n_man(x1))
exists s1 x1 x2.(n_train(x2) & n_man(x1) & on(s1,x2) & Theme(s1,x1) & a_alone(s1))