A boy standing on a roof performing construction.
A girls dances.
It's either a boy doing construction or a girl dancing, it can't be both.
exists e2 e1 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_perform(e2) & n_construction(x4) & on(e1,x3) & n_roof(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_boy(x1))
exists x1 x2.(a_topic(x1) & n_dance(x1) & of(x1,x2) & n_girl(x2))