A man in a gray jacket eating a sandwich.
A man is having his lunch.
A man can be eating a sandwich for whatever mean he wants, not just lunch.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_eat(e1) & n_sandwich(x4) & (x2 = x3) & n_jacket(x2) & a_gray(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_lunch(x2) & of(x2,x1) & n_male(x1) & n_man(x1))