Two homeless men sitting at a park.
Two homeless men are feeding pigeons.
Just because Two homeless men sitting at a park does not mean that they are feeding pigeons.
exists e1 s1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_park(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & a_homeless(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_feed(e1) & n_pigeon(x2) & n_man(x1) & a_homeless(s1) & Theme(s1,x1) & card_eq_2(x1))