A woman is sitting on the sidewalk, sketching an image with chalk.
A woman is drawing animals on the sidewalk.
Just because a woman is sketching doesn't mean she is drawing animals. Just because the woman is sitting on the sidewalk while sketching, doesn't mean she drawing on the sidewalk.
exists e1 e2 x1 x2 x3 x4.(n_sidewalk(x2) & for(e1,e2) & with(e2,x4) & n_chalk(x4) & Theme(e2,x3) & Actor(e2,x1) & v_sketch(e2) & n_image(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
exists e1 x1 x2 x3.(n_sidewalk(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_draw(e1) & n_animal(x2) & n_woman(x1))