A white heron flies into the sky.
A chicken flying
a heron is not a chicken
exists e1 s1 x1 x2.(n_sky(x2) & into(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_heron(x1) & a_white(s1) & Theme(s1,x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_fly(e1) & (x1 = x2) & n_chicken(x1))