A man is grilling food on a barbecue.
The man is making a sandwich.
you do not grill sandwich
exists e1 x1 x2 x3.(on(e1,x3) & n_barbecue(x3) & Theme(e1,x2) & Actor(e1,x1) & v_grill(e1) & n_food(x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_make(e1) & n_sandwich(x2))