A child watches as a woman works on a sewing machine.
The child is using the sewing machine.
Woman and child are different.
exists e1 p1 x1.(exists e2 x2 x3 x4.(on(e2,x3) & n_machine(x3) & of(x3,x4) & n_sewing(x4) & Actor(e2,x2) & v_work(e2) & n_woman(x2)) & as(e1,p1) & Actor(e1,x1) & v_watch(e1) & n_child(x1))
exists e1 e2 x1 x2.(n_machine(x2) & Actor(e1,x2) & v_sew(e1) & n_child(x1) & Theme(e2,x2) & Actor(e2,x1) & v_use(e2))