The dog crouched on the orange rug and stared at the tennis ball.
The tennis ball is yellow.
IT IS NOT CERTAIN THAT THE BALL IS YELLOW.
exists e2 e1 x1 x2 x3 x4 x5.(n_ball(x4) & of(x4,x5) & n_tennis(x5) & n_dog(x1) & n_rug(x2) & of(x2,x3) & n_orange(x3) & at(e2,x4) & Actor(e2,x1) & v_stare(e2) & on(e1,x2) & Actor(e1,x1) & v_crouch(e1))
exists s1 x1 x2.(n_ball(x1) & of(x1,x2) & n_tennis(x2) & Theme(s1,x1) & a_yellow(s1))