A couple at an amusement park.
A couple are having a bad time at the park.
Park doesn't necessarily imply amusement park. It cannot be inferred that the couple at the amusement park are having a bad time.
exists x1 x2 x3.(a_topic(x1) & at(x1,x2) & n_park(x2) & of(x2,x3) & n_amusement(x3) & n_couple(x1))
exists e1 s1 x1 x2 x3.(n_park(x3) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & at(x2,x3) & n_time(x2) & a_bad(s1) & Theme(s1,x2) & n_couple(x1))