A gray-haired man wearing all black is standing on the corner of a busy street.
The man was sitting on a bench.
Standing and sitting are two different things and so you cant be standing and sitting simultaneously.
exists e1 s1 s2 x1 x2 x3 x4.(n_corner(x3) & on(e1,x3) & of(x3,x4) & n_street(x4) & a_busy(s2) & Theme(s2,x4) & Actor(e1,x1) & v_stand(e1) & all x5.(n_black(x5) -> exists e2.(Theme(e2,x5) & Actor(e2,x2) & v_wear(e2))) & (x1 = x2) & n_man(x1) & a_gray-haired(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_man(x1) & on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1))