An Asian woman waiting at an underground train stop.
The woman is waiting for her son to arrive on the train.
It is not clear from the first sentence that she is waiting for her son specifically.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & at(e1,x3) & n_stop(x3) & of(x3,x4) & n_train(x4) & a_underground(s2) & Theme(s2,x3) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_woman(x1) & a_asian(s1) & Theme(s1,x1))
exists e1 p1 x1 x2 x3.(n_train(x3) & n_son(x2) & of(x2,x1) & n_female(x1) & n_woman(x1) & Topic(e1,p1) & exists e2.(on(e2,x3) & Actor(e2,x1) & v_arrive(e2)) & for(e1,x2) & Actor(e1,x1) & v_wait(e1))