A man and a woman standing on a street corner.
A couple is waiting for a taxi.
Just because a man and woman are standing on a street corner does not mean they are waiting on a taxi.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & on(e1,x4) & n_corner(x4) & of(x4,x5) & n_street(x5) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 x1 x2.(for(e1,x2) & n_taxi(x2) & Actor(e1,x1) & v_wait(e1) & n_couple(x1))