A young couple sleep together on a train.
The couple likes each other.
A young couple can sleep together doesn't imply they like each other.
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 x1.(n_couple(x1) & all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_like(e1))))