A woman works by a sewing machine.
The woman is holding blue thread.
A woman working by a sewing machine may not be holding blue thread.
exists e2 e1 x1 x2.(by(e1,x2) & n_machine(x2) & Actor(e2,x2) & v_sew(e2) & Actor(e1,x1) & v_work(e1) & n_woman(x1))
exists e1 s1 x1 x2.(n_woman(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_thread(x2) & a_blue(s1) & Theme(s1,x2))