A white heron flies into the sky.
A bird flies into the sky
A white heron is also a bird.
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.(n_sky(x2) & into(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_bird(x1))