A man with a dog.
There is a man with a dog.
in both sentences, there is a man with a dog.
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_dog(x2) & n_man(x1))
exists p1 x1 x2 x3.((x1 = x2) & with(x2,x3) & n_dog(x3) & n_man(x2))