A woman in a black skirt is reading a book on the subway.
A woman is riding the subway.
A woman in a black shirt can be reading while riding on  the subway.
exists e1 s1 x1 x2 x3 x4.(n_subway(x4) & Theme(e1,x3) & Actor(e1,x1) & v_read(e1) & on(x3,x4) & n_book(x3) & in(x1,x2) & n_skirt(x2) & a_black(s1) & Theme(s1,x2) & n_woman(x1))
exists e1 x1 x2.(n_subway(x2) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_woman(x1))