A couple at an amusement park.
A couple are at a park.
An amusement park is a park; a couple at one establishes that a couple are at one.
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_park(x2) & of(x2,x3) & n_amusement(x3) & n_couple(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_park(x2)) & n_couple(x1))