A fluffy dog in grass.
a dog in the grass
The dog is in the grass is a fluffy dog.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_grass(x2) & n_dog(x1) & a_fluffy(s1) & Theme(s1,x1))
exists x1 x2.(n_grass(x2) & a_topic(x1) & in(x1,x2) & n_dog(x1))