Person smiles at child inside of playground structure.
A mom watches her kid play.
Just because the person smiles at the child does not mean that the mom watches her kid play.  The person may be smiling for another reason.
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 x3.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_play(x2) & of(x2,x3) & n_kid(x3) & of(x2,x1) & n_female(x1) & n_mom(x1))