A brown dog running over grass.
A chocolate lab is playing outside
A brown dog is not necessarily a lab.
exists e1 s1 x1 x2 x3.(a_topic(x1) & over(e1,x3) & n_grass(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_outside(x3) & n_lab(x1) & of(x1,x2) & n_chocolate(x2))