The girl is holding a green ball.
The teenager holds a ball.
We have no idea if the girl is a teenager, she could be any age.
exists e1 s1 x1 x2.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_ball(x2) & a_green(s1) & Theme(s1,x2))
exists e1 x1 x2.(n_teenager(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_ball(x2))