Blond boy eating a sandwich on a white chair.
A boy is eating a burger.
A burger is a type of sandwich, but they generally refer to different things.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_eat(e1) & on(x3,x4) & n_chair(x4) & a_white(s2) & Theme(s2,x4) & n_sandwich(x3) & (x1 = x2) & n_boy(x1) & a_blond(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_burger(x2) & n_boy(x1))