A woman is sitting in the train.
The women is alone.
People do not have to be alone when sitting on a train, and can be accompanied by others.
exists e1 x1 x2.(n_train(x2) & in(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
exists s1 x1.(n_woman(x1) & Theme(s1,x1) & a_alone(s1))