A white dog runs on brown grass.
A dog chases a ball outside.
Dogs can run on their own without chasing a ball.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_grass(x2) & a_brown(s2) & Theme(s2,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_white(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_outside(x2) & of(x2,x3) & n_ball(x3) & n_dog(x1))