Boy playing on the grass with an orange ball.
The boy was having fun playing with the ball.
Playing is a rewording of having fun.
exists x1 x2 x3 x4 x5.(n_grass(x3) & a_topic(x1) & with(x1,x4) & n_ball(x4) & of(x4,x5) & n_orange(x5) & on(x1,x3) & n_playing(x1) & (x1 = x2) & ne_nam_boy(x2))
exists e1 x1 x2 x3 x4.(n_ball(x4) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & with(x2,x4) & n_play(x2) & of(x2,x3) & n_fun(x3))