The girl is holding a green ball.
The boy is holding a red cube.
One cannot be both a girl and boy at the same time. Green and red are different colors. A ball and cube are different shapes.
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 s1 x1 x2.(n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_cube(x2) & a_red(s1) & Theme(s1,x2))