The passengers on the bus are bored.
the passengers are not having fun
There can be passengers on board things besides buses.
exists e1 x1 x2.(n_bus(x2) & n_passenger(x1) & Theme(e1,x1) & v_bore(e1) & on(x1,x2))
exists x1.(n_passenger(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_fun(x2)))