A black bird with a yellow beak standing in green grass.
A blackbird is looking for food in the field.
Just because a black bird is standing the green grass doesn't mean it is necessarily looking for food.
exists s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & in(x2,x4) & n_grass(x4) & a_green(s3) & Theme(s3,x4) & n_standing(x2) & of(x2,x3) & n_beak(x3) & a_yellow(s2) & Theme(s2,x2) & n_bird(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_field(x3) & for(e1,x2) & in(x2,x3) & n_food(x2) & Actor(e1,x1) & v_look(e1) & n_blackbird(x1))