A child smiling in a park
A child is at a park.
at a park is another way to say in a park.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_smile(e1) & (x1 = x2) & n_child(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_park(x2)) & n_child(x1))