Three people are sleeping in a mass-transit vehicle.
Some teenagers are traveling overnight in a train.
Not all people are teenagers and there are many different types of mass-transit vehicles along with trains.
exists e1 x1 x2 x3.(in(e1,x2) & n_vehicle(x2) & of(x2,x3) & n_mass-transit(x3) & Actor(e1,x1) & v_sleep(e1) & n_people(x1) & card_eq_3(x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_train(x2) & a_overnight(s1) & Manner(e1,s1) & Actor(e1,x1) & v_travel(e1) & n_teenager(x1))