A man dresses a child.
The mad undressed the child.
One cannot be undressed and dressed at the same time.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_dress(e1) & n_child(x2) & n_man(x1))
exists e1 x1 x2.(n_child(x2) & n_mad(x1) & Theme(e1,x2) & Actor(e1,x1) & v_undress(e1))