The boy is playing with a colorful ribbon.
A child is playing with a red ribbon.
Just because the boy is playing with a colorful ribbon does not mean it has to be a red ribbon.
exists e1 s1 x1 x2.(n_boy(x1) & with(e1,x2) & n_ribbon(x2) & a_colorful(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1))
exists e1 s1 x1 x2.(with(e1,x2) & n_ribbon(x2) & a_red(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))