A woman is on a carnival swing ride.
a woman is on a date
A woman is not necessarily on a date just because she's on a carnival swing.
exists p1 x1.(exists s1 x2 x3.(on(x1,x2) & n_ride(x2) & of(x2,x3) & n_swing(x3) & a_carnival(s1) & Theme(s1,x2)) & n_woman(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_date(x2)) & n_woman(x1))