A woman sitting on a bench on the sidewalk.
A lady is on a bench.
A woman and a lady can be interchangeable.
exists e1 x1 x2 x3 x4.(n_sidewalk(x4) & a_topic(x1) & on(e1,x4) & on(e1,x3) & n_bench(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_woman(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_bench(x2)) & n_lady(x1))