A woman is reading a book wile riding a train.
The woman is sitting.
That the woman is reading a book and riding on a train does not necessarily mean she is sitting.
exists e1 e2 x1 x2 x3 x4 x5.(Theme(e2,x2) & Actor(e2,x1) & v_read(e2) & Theme(e1,x5) & Actor(e1,x4) & v_ride(e1) & n_train(x5) & (x2 = x4) & n_wile(x2) & of(x2,x3) & n_book(x3) & n_woman(x1))
exists e1 x1.(n_woman(x1) & Actor(e1,x1) & v_sit(e1))