A woman sitting on a chair sewing.
A woman is sewing a quilt.
just because the woman is sewing does not mean it is a quilt.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_sewing(x3) & of(x3,x4) & n_chair(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_woman(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sew(e1) & n_quilt(x2) & n_woman(x1))