The dog is waiting for his master.
A dog runs across the street.
When the dog runs, the dog is not waiting for anyone.
exists e1 x1 x2.(n_master(x2) & of(x2,x1) & n_male(x1) & n_dog(x1) & for(e1,x2) & Actor(e1,x1) & v_wait(e1))
exists e1 x1 x2.(n_street(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))