Two people about to board a bus.
Two people are walking towards the bus doors.
People about to board a bus means they are walking towards the bus doors.
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_about(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_board(e2) & n_bus(x3)) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_door(x2) & of(x2,x3) & n_bus(x3) & towards(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_2(x1))