Man on the beach is throwing a red ball.
A man is throwing a ball with his son.
We don't know it is his son that he is throwing the ball to.
exists e1 s1 x1 x2 x3.(n_beach(x2) & Theme(e1,x3) & Actor(e1,x1) & v_throw(e1) & n_ball(x3) & a_red(s1) & Theme(s1,x3) & on(x1,x2) & n_man(x1))
exists e1 x1 x2 x3.(with(e1,x3) & n_son(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_ball(x2) & n_man(x1))