A baby girl being taken on a walk with her father in a park.
A little girl is on the grass.
A girl might be in the park with her father, but that doesn't mean she is necessarily on the grass. They could be walking on a pathway, etc.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(e1,x6) & n_park(x6) & with(e1,x5) & n_father(x5) & of(x5,x1) & n_female(x1) & on(e1,x4) & n_walk(x4) & Theme(e1,x3) & v_take(e1) & (x1 = x3) & n_girl(x1) & of(x1,x2) & n_baby(x2))
exists p1 s1 x1 x2.(n_grass(x2) & on(x1,x2) & n_girl(x1) & a_little(s1) & Theme(s1,x1))