The brown dog is swimming.
A dog swimming.
There is a dog swimming and it is brown.
exists p1 s1 x1.(n_dog(x1) & a_brown(s1) & Theme(s1,x1) & exists x2.((x1 = x2) & n_swimming(x2)))
exists x1 x2.(a_topic(x1) & n_swimming(x1) & of(x1,x2) & n_dog(x2))