a dog runs across the ground.
A dog running.
'running' is the rephrase of 'runs across the ground'
exists e1 x1 x2.(n_ground(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1))