A man with no shoes sawing a piece of wood.
the man may not have pants on
You cannot assume that because a man does not have shoes on, that he also does not have pants on.
exists x1.(-exists e1 x2 x3 x4 x5.(a_topic(x1) & with(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_saw(e1) & of(x4,x5) & n_wood(x5) & n_piece(x4) & (x2 = x3) & n_shoe(x2)) & n_man(x1))
exists x1.(n_man(x1) & -exists e1 p1.(exists e2 s1 x2.(a_on(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & n_pants(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_may(e1)))