A child holds another child while on the ground.
A child is holding a friends child.
The child the child is holding may not be a friends child. It could be anyone's child.
exists e1 x1 x2 x3.(n_ground(x3) & on(e1,x3) & r_while(e1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_child(x2) & -(x2 = x1) & n_child(x1) & n_child(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_child(x2) & of(x2,x3) & n_friend(x3) & n_child(x1))