A girl in a blue shirt is sitting on a swing.
A girl is at the park.
Even though a girl is sitting on a swing, she might not be at a park; she can be at her backyard or other places where swings can be.
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_swing(x3) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_girl(x1))
exists p1 x1 x2.(n_park(x2) & at(x1,x2) & n_girl(x1))