A brown and white dog walks down a ramp toward a pool of water in which a green tennis ball floats.
A dog is going to get the ball.
Sentence one never says he's going to get the ball, just that he is walking towards them.
(-x)
exists e1 p1 x1 x2.(n_ball(x2) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_get(e2)) & n_dog(x1))