Person smiles at child inside of playground structure.
The children are using the slide.
The person smiling at the child is no indication what the child is doing.  The child may be in the playground but there is no way of knowing that the child is using the slide.
exists e1 x1 x2 x3 x4 x5.(ne_per_person(x1) & at(e1,x5) & n_child(x5) & Theme(e1,x2) & Actor(e1,x1) & v_smile(e1) & of(x2,x3) & n_structure(x3) & of(x3,x4) & n_playground(x4) & n_inside(x2))
exists e1 x1 x2.(n_slide(x2) & n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_use(e1))