A young couple stands together outside a statue.
An old couple sit next to a statue.
It can either be a young couple or an old couple.  They cannot sit and stand simultaneously
exists e1 p1 s1 x1 x2.(outside(e1,x2) & n_statue(x2) & exists s2.(Theme(s2,x1) & a_together(s2)) & Topic(e1,p1) & Actor(e1,x1) & v_stand(e1) & n_couple(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(to(e1,x2) & n_statue(x2) & r_next(e1) & Actor(e1,x1) & v_sit(e1) & n_couple(x1) & a_old(s1) & Theme(s1,x1))