The lady with the cane is sitting on a bench.
A man walks down the street.
One who walks down  cannot be sitting on a bench.
exists e1 x1 x2 x3.(n_cane(x2) & n_lady(x1) & on(e1,x3) & n_bench(x3) & Actor(e1,x1) & v_sit(e1) & with(x1,x2))
exists e1 s1 x1 x2.(n_street(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))