Some kids play in a field.
Some kids play in a grassy field.
The field isn't necessarily grassy.
exists e1 x1 x2.(in(e1,x2) & n_field(x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_grassy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1) & n_kid(x1))