A man sawing wood on a fence.
A man saws a broken part of a wood fence.
A man sawing wood on a fence doesn't mean he is sawing broken part.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_saw(e1) & on(x3,x4) & n_fence(x4) & n_wood(x3) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_saw(e1) & of(x2,x3) & n_fence(x3) & of(x3,x4) & n_wood(x4) & n_part(x2) & a_broken(s1) & Theme(s1,x2) & n_man(x1))