A woman and a child playing with puppies on the sidewalk.
a bird was on rocks
While a woman and a child were playing a bird was on rocks.
exists s1 x1 x2 x3 x4 x5.(n_sidewalk(x5) & a_topic(s1) & subset_of(x2,s1) & with(x2,x4) & on(x4,x5) & n_puppy(x4) & n_playing(x2) & of(x2,x3) & n_child(x3) & subset_of(x1,s1) & n_woman(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_rock(x2)) & n_bird(x1))