a black dog sits on the floor.
A dog is on the floor.
When a dog sits on the floor it is on the floor.
exists e1 s1 x1 x2.(n_floor(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_floor(x2) & on(x1,x2) & n_dog(x1))