a dog in the beach
A dog is on the beach.
"A dog is on the beach" is a rephrasing of "a dog in the beach."
exists x1 x2.(n_beach(x2) & a_topic(x1) & in(x1,x2) & n_dog(x1))
exists p1 x1 x2.(n_beach(x2) & on(x1,x2) & n_dog(x1))