Various people sitting on a subway.
Various people riding public transportation.
Sitting on a subway involves riding public transportation.
exists e1 s1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_subway(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & a_various(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_transportation(x3) & a_public(s2) & Theme(s2,x3) & (x1 = x2) & n_people(x1) & a_various(s1) & Theme(s1,x1))