On garden lawn, black dog is retriving an object.
The dog is outside.
A garden lawn is outside.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & n_lawn(x3) & of(x3,x4) & n_garden(x4) & Theme(e1,x2) & Actor(e1,x1) & v_retrive(e1) & n_object(x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists s1 x1.(n_dog(x1) & Theme(s1,x1) & a_outside(s1))