A man with a dog.
A man pets a dog.
Just because there is A man with a dog does not mean he pets the dog.
exists x1 x2.(a_topic(x1) & with(x1,x2) & n_dog(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_pet(e1) & n_dog(x2) & n_man(x1))