One old homeless guy walks by the park.
A guy drops his sandwich as he passes a park.
Not all guys drop their sandwich as they pass by a park.
exists e1 s1 s2 x1 x2.(n_park(x2) & by(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_guy(x1) & a_homeless(s2) & Theme(s2,x1) & a_old(s1) & Theme(s1,x1) & card_eq_1(x1))
exists e1 p1 x1 x2.(exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_pass(e2) & n_park(x3)) & n_male(x1) & n_male(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_drop(e1) & n_sandwich(x2) & of(x2,x1) & n_guy(x1))