An old man sits.
A man sitting on a bench.
It is not implied that the man sits on a bench.
exists e1 s1 x1.(Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_old(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_bench(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))