a dog runs for the tennis ball.
The tennis ball is being pursued by an animal.
dog runs for the tennis ball simply means tennis ball is being pursued by an animal
exists e1 x1 x2 x3.(n_ball(x2) & of(x2,x3) & n_tennis(x3) & for(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2 x3.(n_ball(x1) & of(x1,x2) & n_tennis(x2) & Actor(e1,x3) & n_animal(x3) & Theme(e1,x1) & v_pursue(e1))