A woman on a subway is falling asleep.
A woman is dancing on the subway.
One can't be dancing while falling asleep.
exists e1 p1 x1 x2.(exists s1.(Theme(s1,x1) & a_asleep(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_fall(e1) & on(x1,x2) & n_subway(x2) & n_woman(x1))
exists e1 x1 x2.(n_subway(x2) & on(e1,x2) & Actor(e1,x1) & v_dance(e1) & n_woman(x1))