An elderly man is preparing vegetables on a busy street.
An elderly man sits on a park bench, feeding the pigeons.
A man cannot be feeding the pigeons and preparing vegetables at the same time.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_prepare(e1) & on(x2,x3) & n_street(x3) & a_busy(s2) & Theme(s2,x3) & n_vegetable(x2) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))
exists e1 e2 s1 x1 x2 x3 x4.(n_pigeon(x4) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x1) & v_feed(e2) & on(e1,x2) & n_bench(x2) & of(x2,x3) & n_park(x3) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_elderly(s1) & Theme(s1,x1))