A dog in a field.
A dog sits in a grassy field.
Not all fields are grassy. One can not assume that the field is grassy.
exists x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & n_dog(x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_grassy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1))