A dog is playing fetch with a ball.
A dog sits on the couch and sleeps.
dog that sleeps can not be playing fetch at the same time.
exists e1 s1 x1 x2.(with(e1,x2) & n_ball(x2) & a_fetch(s1) & Manner(e1,s1) & Actor(e1,x1) & v_play(e1) & n_dog(x1))
exists e1 x1 x2 x3 x4.(n_sleep(x4) & n_couch(x3) & subset_of(x4,x2) & subset_of(x3,x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1))