A young couple sleep together on a train.
They are sleeping in their home.
not every couple is young
exists s1 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_train(x3) & r_together(x1) & n_sleep(x1) & of(x1,x2) & n_couple(x2) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_home(x2) & of(x2,x1) & n_thing(x1) & n_thing(x1) & in(e1,x2) & Actor(e1,x1) & v_sleep(e1))