Children are playing on a playground.
the children are having fun
You can not infer they are having fun.
exists e1 x1 x2.(on(e1,x2) & n_playground(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))
exists e1 x1 x2.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fun(x2))